| Mentor payouts |
Variable |
Include only if gross session sales are recorded; exclude when the model records platform commissions and subscriptions only. |
Double-counting payouts after already modeling only platform revenue. |
| Payment Processing Fees |
Variable |
Model at 2.5% of revenue in the first year, stepping down to 2.1% by the mature year. |
Treating card fees as fixed overhead instead of per-transaction leakage. |
| Cloud Hosting & Software Licenses |
Variable |
Use 3.5% of revenue in the first year, declining to 2.6% as platform scale improves. |
Assuming hosting stays flat while users, sessions, and data usage rise. |
| Digital Advertising & Content Creation |
Variable |
Use 8.0% of revenue in the first year, then reduce to 6.0% by the stabilized period. |
Burying performance spend in overhead and overstating contribution margin. |
| Mentor Vetting & Onboarding Costs |
Variable |
Apply 4.0% of revenue in the first year, falling to 3.0% as onboarding gets more efficient. |
Forgetting that more mentors create more review, screening, and setup work. |
| Office Rent |
Fixed |
Carry $3,000 per month from Month 1 through Month 60 in the break-even base. |
Spreading rent across sessions and making margin look too clean. |
| Payroll |
Semi-fixed |
Load about $43.8k per month in the first year, then step up as planned headcount increases. |
Treating every hire as variable with bookings instead of capacity added in steps. |
| Paid Acquisition Budgets |
Semi-variable |
Use the combined $250k first-year budget, split between seller and buyer acquisition plans. |
Tracking total spend but not the seller and buyer CAC behind it. |