3rd in the world!?!? Idolm@ster leads Xbox live item downloads

(tags Xbox 360, Japan, online, kawaii)

According to the same Microsoft press event at Tokyo Game Show, The IdolM@ster's Xbox Live Item download count is the third largest in the world. (Thanks Geemaga Blog)

This game is Japan only, and coupled with the fact that there are 400,000 consoles in Japan while the US and Europe have like 11 million, does this mean Japanese otaku are picking up the Xbox slack or other territories don't buy into (or pay money for) Xbox Live Arcade online goods? How is this even possible?