Most likely because Colors was a Wii-exclusive, and everyone's declared PS3 vs. 360 the big console war of this generation. I myself rarely ever play my Wii (I know, it's sad.) because I'm so hooked on my PS3.
Surprisingly, the reason Sonic Generations wasn't made for the Wii is because the system doesn't have HD support. No joke, I read it on Wikipedia and it had a reference.
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