Just did some research in to this. The store in question:
1) Has an enormous Hentai Game collection -- an entire FLOOR of the store is dedicated to porn games
2) Is a used game store first and foremost, and people aren't turning in Wii Fit because it's a peripheral game
3) Is in akhibara, the otaku part of town
And would be the last place anyone would ever go for a game like Wii Fit. So, that explains why this particular report was so vastly different from the other ten or so (MC, Famitsu, anecdotal reports, photos) that we've seen.
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