I was actually surprised by my marketshare numbers so I just spent the time parsing BestBuy 4th quarter results ( sadly not same period, it's Jan-Feb-March whereas Gamestore has weird Feb-March-April).
It's hard to dig into Best Buy numbers as they don't separate DVD and CD from gaming.
But for that 3 month period they have roughly 2.3 Billion of US revenue for Gaming +DVD +CDs. For the same period Gamestop would be roughly around 1.5 billions for US revenue ( take or add 100 or 200 millions).
In the end if you remove DVD and CD for BestBuy and used games for Gamestop I woudn't be surprised if their marketshare were quite close from each others....
PS3-Xbox360 gap : 1.5 millions and going up in PS3 favor !
PS3-Wii gap : 20 millions and going down !
