There will always be an excuse as to why good to great quality "mature" games don't sell on wii like they do on the HD twins, no one will admit the obvious. That it's a machine that caters to a different audience, it's simple, it's obvious. But no, it's because marketing, or it's niche, or the weird color scheme, or it's not a popular game director anyway, or that's just not a popular genre, or ect. There will always always always be a reason other than the obvious one.
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