Based on how much Gamestop revenue has climbed over the last 12 months I woudn't be surprised if they haven't actually been gaining marketshare, so maybe the fact that they were a smaller player was probably more true 1 year ago...
Franly I buy all my software and hardware at Best Buy and I will be the first to admit it is generally a lot easier to get a game on release day at Gamestop through their preorder than it seems to be at Best Buy...( the way Best BUy handles gaming varies a lot depending on the shop and I can't say they really do a stellar job of it..)








