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stof said:
Japan is relavent because as the home of two of the three hardware manufacturers and multiple major development studios and publishers, the actions of Japanese game buyers have a significant impact on world wide gaming trends.

Pretty much this.  The best selling games worldwide still come from Japan too (albeit almost entirely from Nintendo).  Actually, subdividing worldwide sales this gen by region of development (JP vs NA vs EU) would be pretty interesting if someone had the time...