Problem is they'll just buy the codes then slap the cost on to the used game cost, so really it's no different to you buying the code yourself.
Though it does mean the game's makers get to see a bit of the money which would have gone solely to it's leech-like retailer instead.
I find it funny how the game companies are self entitled pricks for wanting some money from the resale of their games 'a game they already sold, the bastards', yet the retailers, who sell the games, then buy them back at a fraction of their worth and then sell them on again, are completely different, the loveable little scamps.
hold on a minute:
Maker: makes and sells games, wants money from resale of same game.
Retailer: buys and sells games, wants money from resale of same game.
What exactly is the difference again, asides from one profiteering from the others work? (and buying games at a fraction of the cost they then go and sell them for[yes i know that's how profiteering works, but it still feels like a scam])