I could be wrong as I can't really give you a link but I believe at the time when I heard that NPD lost WallMart as a customer the buzz was that they had lost coverage of roughly 30% or so of the market...( they claim to cover 65% of the market and they don't do WallMart so it has to be under 35%).
The thing about Gamestop ( I don't like them either and will never buy a game there) is that they have a TONN of shops. I am in Colorado, not really the state with the most population and I have 10 Gamestops within a 25 miles radius and that does not include Denver...








