Well thank you oh vigilant employee for enlightening my darkness
I suppose the 10% of on purchases is the best thing along with potential rewards but as a general note. Do not trade in anything at Gamestop. At least I don't. It is not worth it. You get ripped off. The only thing worth it would be when you trade in an older system (i.e. DS) for value towards its newer counterpart (i.e. 3DS)