1. The Economics: Why 10% Margin Difference Changes Everything
In trading card retail, net margins typically range between 15% and 25%. When a marketplace takes 12% to 15% off the top of gross sales, they are not just taking 15% of your revenue—they are often taking 50% or more of your net profit.
On a $100 card sold on TCGplayer where your inventory cost was $70: you make ~$17 net after $13 in fees. On your owned website, you make $27 net. That is a 58% increase in net cash in your pocket on the exact same card.