I think it's because of advertising. Everyone knows what a PS3 is but not so many know what a 360 is. In the shops most of the space goes to the PS3 with a small area for the 360, for people who don't know about games it looks like the 360 is a very minor or insignificant console. It's not because Japan is not willing to support a foreign item - otherwise Apple wouldn't be as big as they are in Japan!
If Microsoft increased their advertising budget for Japan, they might see an increase in sales.







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