| Office Rent |
Fixed |
Carry $5,000 per month from Month 1 through Month 60, regardless of orders or seller count. |
Spreading rent across orders and making unit margin look weaker than it is. |
| Core Platform Licenses |
Fixed |
Include $3,000 per month as base overhead before calculating contribution margin. |
Treating the license stack as usage-based when the model shows a flat monthly charge. |
| Payment Processing Fees |
Variable |
Apply 2.5% of revenue in the first year, declining to 2.1% by the fifth year. |
Ignoring processor fees and overstating contribution on every order. |
| Cloud Hosting (Variable) |
Variable |
Model as 1.5% of revenue in the first year, declining to 1.1% by the fifth year. |
Calling hosting fixed while traffic and transaction load push usage higher. |
| Affiliate Partner Commissions |
Variable |
Deduct 3.0% of revenue in the first year, declining to 2.2% by the fifth year. |
Counting affiliate-driven sales at full margin and missing the payout drag. |
| Digital Advertising (Performance) |
Variable |
Use 6.0% of revenue in the first year, declining to 4.0% by the fifth year. |
Treating paid performance spend as harmless overhead instead of a direct break-even lever. |
| CEO, CTO, Engineering, Support, Accounting, and Brand Curation Payroll |
Semi-fixed |
Hold base salaries steady, then step them up as full-time equivalent staffing rises with scale. |
Smoothing headcount into a clean percentage and hiding hiring cliffs. |
| Seller and Buyer Acquisition Budgets |
Semi-variable |
Model annual budgets by channel, then test CAC: sellers fall from $500 to $350, buyers from $25 to $15. |
Treating acquisition as fixed overhead when CAC controls how fast losses turn into payback. |