You paid for your ad campaign and waited for the orders. When they started coming in, it felt like the spending had finally paid off. But after paying for the cost of goods, order fulfillment, shipping, and advertising, you found that the remaining amount was far less than you expected. You might even find yourself back at the question you started with: Is advertising really worth what I'm paying?

The decision is tougher now. If you stop the campaign, you fear the orders will stop with it. If you increase the budget, you worry you'll spend more without improving what's left for you. In front of you is a report showing sales and orders, while what you really need to know is what these results actually left behind for your store.

To understand this, you need to combine your sales revenue and associated costs into a single calculation. The campaign might have genuinely attracted buyers, but discounts, product costs, or order fulfillment ate up most of the revenue before accounting for advertising. Identifying where the issue lies helps you figure out what needs tweaking before deciding whether to continue or stop.

In an interview with Salla, Mohammed Al-Omari, a business development and financial performance analysis specialist, presented an example illustrating this paradox: an advertising channel that generated 40 orders left a larger net amount than a channel that generated 100 orders. From this comparison, we begin answering the question: How do you know whether your campaign deserves a bigger budget?

Watch Mohammed Al-Omari's comparison between ad channel results, starting from minute 26:51.

The Comparison | How can 40 orders leave more money than 100 orders?

Suppose the first campaign generated 100 orders, leaving SAR 8 from each order after subtracting associated variable costs, including its share of the advertising spend. The total remaining amount comes to SAR 800.

In contrast, the second campaign generated 40 orders, but the remaining amount per order was SAR 25 after calculating costs in the same manner. The total remaining amount comes to SAR 1,000.

The second campaign generated fewer orders, but it left the store with a larger sum to help cover fixed overheads and generate a profit.

100 orders × SAR 8 = SAR 800, versus 40 orders × SAR 25 = SAR 1,000

This remaining amount is known as the contribution margin, and it differs from net profit; there are still other store-level overheads, such as salaries, software subscriptions, and rent, depending on the nature of the business.

For the comparison to be meaningful, calculate costs consistently across both campaigns, compare equivalent time periods, and account for differences in products, promotions, cancellation rates, and returns. Part of the variance might stem from the specific products each campaign sold, rather than the advertising channel alone.

The Order | How much remains after each sale?

Start with the post-discount sales value, then deduct the cost of goods sold and the variable costs associated with acquiring and fulfilling the order. Be careful not to double-count discounts; if you are using the net amount the customer paid after the discount, do not subtract it again.

In a simplified example of a single-product order, the customer paid SAR 200. The product cost was SAR 100, packaging, payment processing fees, and store-absorbed shipping totaled SAR 25, and the order's share of ad spend was SAR 35. That leaves SAR 40 from the order:

200 − 100 − 25 − 35 = SAR 40

These forty riyals contribute toward covering the store's remaining overheads and generating profit. If they do not cover the business's share of these expenses at the current sales volume, orders may increase while the store remains under financial strain.

Repeat this calculation across all campaign orders, or use averages derived from actual campaign data. If product costs vary significantly, review them on a product-by-product or category basis rather than relying on an average that masks key differences.

Also ensure consistent handling of VAT across both revenues and costs, and accurately record any shipping fees paid by the customer versus what you absorbed, so the calculation reflects the true operational reality.

The Metric | Does a high ROAS mean you're making a profit?

Return on Ad Spend, or ROAS, compares the revenue attributed to advertising against what was spent on it. If SAR 10,000 in sales is attributed to a campaign that cost SAR 2,000, your ROAS is 5.

This tells you that every riyal spent on advertising generated SAR 5 in attributed revenue, but it doesn't tell you what was left after product costs, fulfillment, and other operational expenses.

Suppose the product and order fulfillment costs for these sales totaled SAR 7,500, and advertising cost you SAR 2,000. That leaves SAR 500 before fixed overheads and any other uncalculated expenses. If product and fulfillment costs were instead SAR 8,500, the result would be a SAR 500 loss before fixed overheads—even though the ROAS remained at 5.

For this reason, tie your ROAS targets to product margins and sales costs. A target that works well for a high-margin product might not be viable for a product whose cost eats up most of the retail price.

Customers | Are you comparing new customer acquisition to repeat purchases?

A campaign targeting existing customers may appear far more cost-effective than one targeting people who have never heard of your store. However, the difference in audience and objective must be reflected in your evaluation.

Evaluate whether the campaign aims to acquire new customers, reactivate previous ones, or cross-sell another product. Then track the cost per result and the margin contribution left by orders in each scenario.

Be mindful of the difference between ad cost per order and customer acquisition cost (CAC). Dividing your spend by all attributed orders gives you the ad cost per order. Evaluating new customer acquisition, however, requires identifying the number of unique first-time buyers the campaign brought in, according to your attribution model.

You might accept a lower contribution margin on a first order as part of a customer acquisition strategy, but this decision requires reliable data on repeat purchase rates and the value generated by subsequent orders. Calculate your CAC payback period and what your cash flow can sustain before scaling spend based on projected future returns.

Adapted from his discussion on Salla's panel.

Leakage | Where did the expected margin go?

When campaign returns fall short of expectations, trace the line items that shifted during the sales cycle. The campaign might have promoted a low-margin product, coincided with heavy discounts and free shipping, or generated a high volume of orders that were later cancelled.

Review realized discounts, fulfillment costs, payment gateway fees, and return rates, then compare them against your initial assumptions when launching the campaign. If returns lag past the reporting window, update your figures once they settle so you don't base decisions on unearned revenue.

Before rolling out a new promotion to boost conversion rates, calculate its impact on net margins per order. You might succeed in lifting order volume while eroding unit contribution to a point where you need disproportionately higher volume just to break even.

Read also: How to Calculate the Impact of Discounts on Your Profit Margin?

If advertising continues to squeeze your margins despite optimizing spend, you may need to revisit your pricing, cost structure, and the core value proposition you offer customers.

Read also: Between Lost Profits and Lost Customers… How Should You Price Your Products?

Budget | Can you fund the additional orders?

Even if orders yield healthy contribution margins, scaling ad spend may require purchasing inventory and fulfilling orders well before sales proceeds clear into your bank account. Therefore, review your available liquidity, cash collection cycles, and supplier payment terms alongside campaign performance.

Ask yourself before increasing your budget: Is inventory available? Do I have enough working capital to fulfill projected order volumes? And how do collection timelines align with my upcoming payment obligations?

Scaling spend requires the operational and financial capacity to fulfill incoming demand seamlessly, without delays or straining other financial commitments.

Read also: Your Store's Sales Are Growing, But Where Is the Cash Flow?

The Decision | What should you review before increasing spend?

Consolidate your campaign metrics into a single sheet, using a consistent methodology so you can accurately compare periods and campaigns.

Net Sales: What is your sales value after discounts, cancellations, and returns? Ensure this figure accurately reflects the specific orders you are evaluating.

Variable Costs: How much did you spend on product costs, packaging, payment processing, absorbed shipping, and other per-order fulfillment costs?

Campaign Cost: Factor in total ad spend and any direct costs specifically tied to the campaign, avoiding any duplicate accounting.

Total Remaining (Contribution Margin): What is left after deducting the costs above? Has it improved relative to the benchmark period or campaign?

Quality of Results: Did you acquire new customers? What were the cancellation and return rates? Do you have verified data on repeat purchase behavior?

Scalability: Can you finance and fulfill additional orders at the same quality standard? When increasing the budget, watch closely to see whether efficiency holds or if cost per order begins to spike.

Attributed figures often differ between advertising platforms and your store's backend analytics due to attribution window variances. Watch out for order double-counting across multiple ad platforms before summing up results, and rely on actual net sales recorded in your store.

Once you've audited your costs and defined your spending capacity, discover Salla Ads and the available solutions to launch and manage your store's campaigns.

Next Steps | Scale the budget or pause the campaign?

Start by auditing a campaign with mature, reliable order data. Determine whether it generates a positive contribution margin after deducting sales and advertising costs, and whether that contribution aligns with your target return.

If the performance is solid and stable—and you have the inventory, working capital, and operational capacity—you can test a controlled increase in budget, closely monitoring the impact on cost per order and total contribution. A campaign's efficiency at a lower spend does not automatically carry over at higher spend levels.

If orders are coming in but unit margins remain thin, isolate the specific cost driver eroding profits before allocating more budget. You may need to refine the promotional offer, adjust the product mix featured in the ads, streamline fulfillment costs, or re-evaluate your pricing strategy.

If data is incomplete or tracking is unreliable, focus first on fixing attribution, reconciling cancellations, returns, and variable costs. If losses exceed your predefined testing threshold, scale back spend or pause underperforming segments until the underlying issue is resolved.

To deepen your understanding of cost analysis, break-even points, and cash flow management, learn e-commerce financial fundamentals with Mohammed Al-Omari on Salla Academy.

Before making your next budget decision, line up three core figures: net sales retained by the store, the total cost to generate them, and the net margin remaining. This clarity will show you what is truly ready to scale and what needs adjustment before you commit more capital.

Planning to launch your e-commerce business? Create your store on Salla, and set up your product catalog and unit economics before launching your first campaign.