Personally, I've never, ever been against any band allowing their music to be used in commercials. Besides being a business, if I have to put up with commercials, than I want to hear some good music with them.
The ones that are really pissing me off though are those created by what must be the most unevolved Ad creatures on the planet! Those commercials that keep using the very same way overly worn out Rock classics from decades ago, especially crap like Bob Seeger. There's a ton of music out there, even if you want to limit it to old songs they think will appeal to aging Baby Boomers. Pick something else for crying out loud!