Just to prove my point on ad's, here are 4 i just found in a quick Youtube search.
http://www.youtube.com/watch?v=ltLe1r2qUxQ
http://www.youtube.com/watch?v=acOHSDRN9_o
http://www.youtube.com/watch?v=Go0fa4j-c2U
http://www.youtube.com/watch?v=CAijoYh3F7s
When the console is advertised like this, it's pretty obvious which gamers are going to be primarily on Wii. Thus, it's pretty obvious which gamers the 3rd parties will put the majority of resources towards.
Edit: I posted the same one twice... Stupid. But the point still stands.