Short answer: Nail unit economics on the first 100 orders before scaling ads.
Hedge: fee figures are illustrative; confirm the live Seller Centre rate card. Not tax/legal advice.
Key table
| Band | Focus | |
|---|---|---|
| 1-20 | Fees+COGS only | |
| 21-50 | Small ads tests | |
| 51-100 | Stable contribution | |
| 100+ | Scale with floor |
What to do
- Write target contribution per order
- Refuse big ads until samples are green
- Kill losers early
- Re-run calculators on every price change
Links and tools
Internal reading: price · fees_tt · sku · excel.
Model fees with the fee calculator.
Inseller
Inseller is the profit layer next to Seller Centre — actual fees, ads and SKU contribution so dashboards do not hide red contribution margin.