Why do most third party publishers ignore the Wii completely ?

[dsps3wii]

How can people say that third party games don't sell well on the wii. The Beatles: Rock Band wii, codmw reflex, Cabela's game hunter, band hero, just dance, disney sing it that is a sample of world charts on this site of the top 50 games of this week. why is codmwii selling so well why? is it because it is a causal game?