Small Online Shop Marketing ROI Case
Business context
A small online shop runs a one-month paid marketing test to see if it should keep spending on ads.
The numbers below are simplified fictional examples used for educational purposes.
The numbers
| Marketing spend (test month) | $1,000 |
| Additional sales generated | $4,000 |
| Product cost on those sales (COGS, ~60%) | $2,400 |
Step-by-step calculation
Additional gross profit = $4,000 − $2,400 = $1,600
Net result after marketing = $1,600 − $1,000 = $600
Simple marketing ROI = Net result / Marketing spend = $600 / $1,000 = 60%
| Additional revenue | $4,000 |
| Additional gross profit | $1,600 |
| Net result after marketing | $600 |
| Simple marketing ROI | 60% |
What this means
A common mistake is to look at $4,000 of new sales from $1,000 of ads and conclude the ads return 4×. But the products themselves cost money — only $1,600 was actually gross profit, and after the ad spend only $600 of real profit remains. The campaign is still positive, but much less impressive than the revenue number alone suggests.
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Payback interpretation
In this test, the ads paid for themselves within the same month (positive net result). If the same numbers continue, every $1,000 of ad spend brings about $600 of profit. Before scaling up, the shop should check whether the same return holds at larger budgets — paid marketing often becomes less efficient as spend grows.
Warning
- Do not confuse extra revenue with extra profit.
- Always subtract product cost (COGS) before judging a campaign.
- Returns, refunds, and shipping can further reduce real profit.
- A small successful test does not guarantee the same result at 10× the budget.
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This case study is for educational and planning purposes only. It is not accounting, tax, legal, investment, or financial advice. Numbers shown are simplified fictional examples.