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There's simply no way Wii Fit can have a 75% attach rate. It's not for everyone. I bet you that not even 50% of Wii owners in America are interested in getting more fit and willing to do something about it. And America is most likely the strongest market for this game.

If the balance board reaches 50% of Wiis, that'd be phenominal.  But I'd guess it would be under 40%.