Ah, that's up to you dood - you can keep it if you wish, as I have it for the 360 (which you should get and would cost you about £10, or £20 if you got the GOTY addition with all the add ons) and if you returned it I would only sell it.
In fact, you should take a look at my PC games next time you are over - I am planning to sell the majority of them in a car boot sale or on ebay or something, as I never ever play the PC for games (And lets be honest, I'll copy the ones I think I may possibly play again).

