3x increase is actually quite a bit.
Price cuts alone usually don't have a huge impact in Japan most of the time.
Hardware revisions/new colors cause bigger boosts over there. It's the opposite in North America/Europe.
I think Nintendo will have a new Wii color this holiday, either for NSMB Wii (Retro Famicom color Wii would be cool) or one for Tales of Graces probably.







