The return policy at EB is pretty good, you don't need to have "a good" reason to return a game as long as you have your original receipt, the game is in the same condition you brought it and it isn't online only. So buy what ever game you want, try it and if you don't like it, then take it back, try not to abuse it and be honest. And as for doing it until a game comes out that you want, you could just use the return to preorder it.
ebguy