Wow, once again I have to congrat Dodece for some great points, and throw in my own here.
I also find a lot of the 'core' gamers that own Wii, also own another system, and unless the Wii brings something special to the game (like in Tiger Woods or Okami), they will always choose to get the version with the better graphics. And why wouldn't they? Madden is the most obvious case of this, the Wii version reviewed well but is selling quite poorly compared to PS3 and is nothing at all compared to 360. Personally I think EA is failing to notify people that it has 'family' controls or whatever, and missing a lot of potential sales, but that's another matter.
For this reason it's more pratical to develop for the PSP than the Wii in Konami's thinking.
If a 'core' game is developed for the Wii, then I'm sure it'll sell well (if it's good). But multi-platform titles where the Wii adds nothing, will fair poorly compared to other systems.
