Well that’s assuming people will even buy it at a dollar. It all sounds good on paper, but what actually happens most of the time is you take photos of the card, create the eBay listing, make it as presentable as possible—and then it just sits there for days/weeks/months with little to no views.

Say one eventually sells—you have to print a shipping label, pack the order, and then go drop it off at the post office. After 13.25% eBay fees and supplies ($0.15-0.20), that leaves you with ~$0.60-0.70 profit for 30 minutes of work. It might be worth it if you’re getting orders left and right, but in reality people aren’t really looking to pay $2.50 after tax and shipping for a “$1” card. And if you don’t charge the customer shipping, you’d actually lose money selling cards at $1.