What? businesses doing business-like things? ...Get the fuck out. That's just total nonsense.
...Okay really, Gamestop makes most of their money off of used games, and they don't have to give anyone else a cut of a resale. Think of it like being sued. The plaintiff will look for as many reasons as possible to inflate the damages the defendent has to pay. Like piracy, opening the game, using the game, seeing the games content, physically damaging the precious plastic wrap, having dust coming into contact with the disc, getting skin oil on the case, ..you get the idea. All of that lowers and lowers the price to nothing. However when they sell the game, they've cleaned it up, added more plastic wrap and they're confident that it's just like new! So they charge tons of money for it (2-10 dollars off brand new) and they profit.
It makes them assholes, but it doesn't make the morally bankrupt satanists.