A founder I know hit $340K revenue last quarter...
A founder I know hit $340K revenue last quarter.
Best month ever. She screenshot the Shopify dashboard and posted it in our group chat. Everyone congratulated her.
Two weeks later she messaged me privately:
"I don't understand. The number was real. But I'm looking at my bank account and something doesn't add up."
We got on a call. I asked her one question:
"Have you ever calculated contribution margin per SKU — after returns, actual shipping cost, and ad spend per unit?"
Silence.
She hadn't. Nobody had told her to.
We spent 40 minutes going through her top 5 SKUs. What we found:
Her #1 best-seller - the one she'd been scaling hard for 3 months - had a 19% return rate, a dimensional weight penalty on shipping she'd never accounted for, and ad spend that looked fine at campaign level but was $11.40 per unit when allocated properly.
Contribution margin: $2.80 per unit.
She'd been pouring budget into a SKU that returned less than 1% of revenue as actual margin. Every dollar she scaled cost her more than she made.
Her #3 SKU - the "slow" one she almost paused - had a 4% return rate, low fulfillment cost, and loyal repeat buyers who found it organically.
Contribution margin: $19.60 per unit.
She restructured her ad budget that week. Cut spend on the best-seller. Doubled down on the quiet one.
Month-end cash position: completely different picture.
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This is what analysts call a toxic SKU — high revenue, invisible margin drain, hiding behind blended averages until cash flow stops making sense.
Three numbers per SKU, every week:
1. Net revenue (after returns + discounts)
2. True fulfillment cost (actual invoice, not your estimate)
3. Ad spend ÷ units sold from that campaign
What's left = your real number. That's what you scale.
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