Well It's not just about how many people buy third party games, it has to do with the controller. Due to the novelty of the Wii-Mote it makes it hard to develop a good game, and even harder to port a good game.

Thats not necessarily the case though, as many Developers have often said how they are intrigued by the Wiimote and would like making a game that utilizes its features. It was viewed more so as a novelty early in the consoles life, and after developers saw the potential in the system they opted out of making quick rushed money grabbers and strapped in for some better looking and playing titles which will come out this year at some point.

Sales is the big player in this, or one of the bigger one's at least.
Thats why we stopped seeing NHL games on the Gamecube (no NHL 07) because it didn't sell well, and thats why we have yet to see one on the Wii.

Oh, snap.
Glad I picked it up then.

It's a fun game, but it will make your brain explode.
Not to mention it's $10 cheaper than most other games.
It warrants a purchase.

I really want Zack & Wiki, sadly i didnt get it for Christmas but as soon as i have some spare cash i'll pick it up.

Capcom seems to do quality work on the Wii so everyone should really buy their games and then it might encourage them to even bring a version of RE:5 to Wii as well. The next Capcom game that is a must have on my list (after Zack & Wiki) is Okami, i never played the PS2 version so im really looking forward to it on Wii.