Short answer: Before 11.11 or double-day, stack fees + vouchers + ads on paper. Campaign GMV without contribution margin is a busy loss.
Hedge: fee figures are illustrative; confirm the live Seller Centre rate card. Not tax/legal advice.
Key table
| Layer | Check | Fail mode |
|---|---|---|
| Fees | Rate card date | Wrong % |
| Vouchers | Stack depth | Margin wipe |
| Ads | Net ROAS floor | Vanity spend |
| Stock | Lock before live | Cancels+AHR |
What to do
- Use the 11.11 checklist post as the master list
- Model kits with bundle COGS rules
- Cap ads when health is yellow
- Reprice free-shipping lines
Links and tools
Internal reading: camp · voucher · bundle · fees_tt.
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.