Hubby shops at EB all the time (shrug, he likes the local one) and he says that he takes games back with no problems - both new and used. They give him full store credits, but he said that's what he asks for. They all know him in there, he's been shopping at the same one for ages.
I do have to agree that games are probably the only place I can think of where you find out your terms and conditions
after your purchase. But I really think that most people (unlike us who have had a reason to read this one) don't even bother to read a EULA. I mean your average user - someone just pulling a game out of the wrapper and playing it. Who sits down and says, "Hmmm, I have a new shiny game, but let me sit and read this legal mumbo-jumbo first?"