Well Im more of a PC gamer myself, but I do own a Wii. However, I have only payed for one Wii game, and that was Guitar Hero 3, as I got 2 guitars with it, and I now use them for every other guitar hero and Rock band. My Wii is chipped, and I downloaded every single game I have for it. Also, the same applies to every PC game I have.
In my opinion, games ARE way too expensive. I think 25 Euros for a Wii game is enough, and 30 or 35 for a PS3 & XBox 360 games, as well as PC. I think companys should do like Valve and release shorter games at cheaper cost, BUT released more frequently. I think that would probably work better.