I bought a $100 e-gift card off someone for $60 and it got taken out of my account 1 hour later. These really aren't safe to buy unless it's a physical gift card or it's already deposited onto the account. Good luck with your sale, anyone taking this should have some collateral in his hands.
Yeah I've heard that some people figured out how to generate codes, and Amazon is cracking down on that. But the codes I get are payments from amazon, so they are legit and won't get removed. Like I said I will only deal with an escrow, and I don't mind having the escrow hold on the transaction for a day or two to confirm it wasn't just fake generated code.