Well the HD consoles are getting much more big budget games. And these games are always very front loaded. Even if Wii Fit never got to number 1 in the US (I know it did but just saying if) the fact of the matter is it will outsell every single game on PS360 including games that sold 2 million week 1. So to look at what is at the top of the chart and use that to determine what sells is a ridiculously inaccurate approach.
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