Probably because not too many people are interested in a two year old port. I am thinking that most hardcore gamers are going to own a combination of the Wii and one of the two other systems. So most of the ones that wanted to play it have already played it. So the big sites are focusing more on newer game releases that they think more people are interested in.
And I know what you are going to say. Dsister there are a lot of people that only own a Wii. And like I said earlier in my post they are more than likely casuals. And I am not saying that just because you own only a Wii that you are casual, just that most of the hardcores will own more than just the Wii
And here are some videos







