Choze, why would he get a discount? It's not a used game.
Odd, if I buy a game, open it, then go to return it, they won't take it back because it's "used".
GameStop is not to blame, if anybody you should blame publishers for not including a empty box for the store to use as a display copy.
Also odd. Target, Walmart, KMart, Toys R Us, Game Crazy (when they existed), etc., etc all seem to get by without the publishers having to supply them with display materials.