Wii = 3.38m America.
360 = 6.38m America.
That's probably a big reason you see few people who have 'em.
You also likely know more people who are of the "14-24" age group, which is where 360 has its greatest strength against Wii.
Meanwhile, your mother probably knows many people who are beyond that age group - which would explain their greater interest in Wii.
Lastly, no, the stores have little/nothing to do with it. Wii has large amounts of sales that are non-America, especially compared to 360.
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