| Artisan inventory sourcing |
Variable |
Rises with box revenue; use 10.5% of sales in the first year. |
Treating gift sourcing like overhead. |
| Sustainable packaging materials |
Variable |
Include in per-box margin; use 4.5% of sales in the first year. |
Ignoring packaging waste and damaged items. |
| Fulfillment labor and shipping |
Variable |
Tie to orders and shipping zones; use 3.5% of sales in the first year. |
Averaging all shipping too low. |
| Transaction fees and API integrations |
Variable |
Charge against sales; use 1.5% of revenue in the first year. |
Leaving merchant fees out of margin. |
| Fulfillment center rent |
Fixed |
Hold at $4,500 per month for the relevant planning range. |
Signing space before order volume is proven. |
| E-commerce hosting and commerce tools |
Semi-fixed |
Model $2,500 per month until the platform tier changes. |
Assuming software stays flat at scale. |
| Warehouse utilities and maintenance |
Semi-variable |
Start with a $600 monthly baseline, then pressure-test peak volume. |
Ignoring peak-season utility and repair spikes. |
| Marketing budget |
Semi-fixed |
Use the planned $45K first-year spend, then track CAC separately. |
Confusing planned spend with true CAC. |