If you've never sold anything on eBay before, you probably weren't aware of how much can get lost in fees. Worst case so far happened today. Someone bought a card from me for $0.50 (Mishra's Factory from Fourth Edition). It cost me $0.03 to list the card in the store (actually, since I listed the item with quantity 2, I guess you could say it cost $0.015 per card). I was charged a Final Value Fee of $0.04 for the card. Then PayPal charged me $0.39 to accept the payment for the card. So grand total I lost $0.445 in fees on a $0.50 item - a net gain of only $0.055!!!!! And since the card cost me $0.05 originally....

I fear what will happen when someone buys a single $0.10 item from me. I will be paying to send the card to someone! You start to see why many sellers build in outrageous "handling" fees on their items. If this becomes a problem I may have to do the same myself!