Xenophobia is one of the reasons Japan doesn't have good charts :
http://www.kotaku.com.au/2010/01/square-enix-says-japanese-retail-prejudiced-against-western-games/
“Even now, there have been people in Japan using the label youge- (Western games) with a terribly discriminatory meaning,” Wada said in an interview Japanese TV from last December in which he discussed Square Enix and Modern Warfare 2, which it published in Japan. “I’d like them to try it once. If they play it once, they’d realise how incorrect that label is.”
As we previously mentioned, the term “youge-” has been used to separate Japanese games from foreign titles, which, until recently, were believed to have little or no appeal to Japanese gamers. “Game” (ゲーム）refers to video games. “Youge-” (洋ゲー）means something else – these games are different, they are the other.
Wada clarified the reluctance to embrace Western games in Japan somewhat. “Well, actually, I’ve found the person that is prejudiced is actually the retailer and not the actual players,” Wada told website Edge Online. “The retailers have a prejudice against overseas titles, and they won’t procure them.”
