There are popular headliners, but I wouldn't go so far as to say "that many". And this is from a guy who's Pandora and Last.FM are constantly set to indie stations. But if they're good, they're good, no matter how obscure OR how popular. It's one of those things that irritates me greatly: assigning more cool points to a band the more obscure they are, and taking cool points away for popularity, instead of for talent. You can be obscure and talentless, or popular and talented.
When I saw "that band from that one commercial", I thought, "they must mean Feist", and sure enough, there they are.