What's wrong with selling (out)?

Muchmusic just had this episode of "The New Music" where some artists were complaining about other artists who sell their music for use in commercials. Like doing that somehow makes them less worthy as a musician or something. Whatever. I've found a lot of great music because of commercials, stuff I probably wouldn't have heard of (or been reminded of) otherwise. And there's nothing wrong making money doing what you love.