I hate GameStop as much as the next person, but I do have to give them credit, they were legitimately great when I bought a bunch of Pokemon DS games last summer. I got to inspect all the cartridges to make sure they weren't counterfeit, and they had a buy 2 get 1 deal doing on, so I got one of them for free.
It also sounds stupid, but I occasionally enjoy the nostalgic experience of being handed my video game equipment from a greasy, disheveled dude, and having him rattle off a bunch of forced marketing stuff in a half assed manner. I'll miss it a little bit.