Its the grammys not a wedding. And I think that's part of kanye's point. It a stage for music why not make musical statements?
Dude he started the whole thing off by admitting that the Grammys are a joke. For something that is a party for "rich musicians" he seems mad salty about some awfully silly shit. The fact that he's talking about artistry and then continues to bring up popularity further reinforces the fact that he is really confused with art. There's always going to be some point where art and money collide but there's a big difference between the curve of Beck vs. an artist like Beyonce.