Trestres, the wii isnt being ignored by devs, the thing is you just dont see it, there are games that release on the wii by these developers, the games that were amazingly innovative, and appeal to gamers looking for fresh ideas, great experience's etc... those games "Zack and Wiki, The Blob, World of Goo, etc..." sold very little on the wii, maybe its because of the audience, but nevertheless those games which you guys love, dont sell, but games like carnival games, game party, etc.. do sell, and because of that reason, developers dont find it necessary to release high quality games that appeal to core gamers like you and myself, but release these "lesser" quality games that appeal to the wii's audience, which sell tons of copies.
Ofcourse its completely different with nintendo, but the fact of the matter is, third parties arent jumping ship because of that reason.