It would have to be a site truly dedicated to saves and whatnot, and worth visiting on its own, otherwise people would probably just get them off of GameFAQs.com.
I mean, my site (VGMaps.com)'s content could easily be a part of GameFAQs.com (yes, for some games I have seen stitched-together screenshot maps there) so it took a really long start before it became big enough to be noticed by anyone. (But still, half a million hits in four and a half years? GameFAQs.com gets multiple times that a day so I still can't compete directly.) Having a handful of saves isn't going to cut it, but you have to start somewhere, so you'll have to stick it out until you have hundreds and maybe thousands if you want the site to be worth your time and for it to be worth other people's time to visit.
Sure, it can just be a hobby, but if the Wii becomes as popular as everyone hopes, you might not be the only one already contemplating this, and GameFAQs.com will be likely to get a bunch of those saves.