| Payment Processing Fees |
Variable |
Subtract 2.5% of first-year revenue, falling to 2.1% by Year 5. |
Treating payment fees as fixed overhead. |
| Server Hosting & Infrastructure |
Variable |
Subtract 3.0% of first-year revenue, falling to 2.2% by Year 5. |
Ignoring usage spikes from high-demand ticket releases. |
| Customer Support Operations |
Variable |
Subtract 4.0% of first-year revenue, falling to 3.0% by Year 5. |
Undercounting support load from refunds and failed orders. |
| Sales Team Commissions |
Variable |
Subtract 5.0% of first-year revenue, falling to 3.0% by Year 5. |
Mixing seller acquisition CAC with sales commissions. |
| Office Rent |
Fixed |
Include $5,000 per month from Month 1 through Month 60. |
Tying rent to ticket volume. |
| General Software Licenses |
Fixed |
Include $1,200 per month from Month 1 through Month 60. |
Forgetting required tools in the fixed monthly base. |
| Marketing Budget |
Semi-variable |
Model combined seller and buyer acquisition spend at about $54,167 per month in the first year. |
Assuming acquisition spend stays flat as CAC changes. |
| Customer Support Specialist hiring |
Semi-fixed |
Step headcount from 0 FTE in Year 1 to 1 FTE after Month 13, at $55,000 annual salary per FTE. |
Treating support headcount as fully variable. |