Although I'm not gonna buy that game, I do get the impression that Western countries are becoming "increasing health aware". I guess this will help transform into more sales. In addition, it was announced that Wii Fit will be sold A$149 in Australia, which is around £69 in pounds. So it's £30 more expensive than the typical Wii game, although decent marketing may persuade consumers to buy it regardless.
As for the supply constraints in NA, I get the feeling that Wii shipments arrive fortnightly, hence you have yo-yoing sales in the past weeks.
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