i think it's because the HD versions don't need any more advertising to sell like crazy while the wii version won't sell anything without advertising. and they realize that they need to build up their strength with wii gamers because very soon thats gonna be larger than the hd market and they need their games to start selling on the wii.
end of '08 predictions: wii - 43 million, 360 - 25 million, ps3 - 20 million
Games I've beat recently: Super Mario Galaxy, Knights of the Old Republic, Shadow of the Collossus
Proud owner of wii, gamecube, xbox, ps2, dreamcast, n64, snes, genesis, 3DO, nes, atari, intellivision, unisonic tournament 2000, and gameboy