Lots of good points there i must say. With regard to Blindness, i know 3 people who bought Fall Heads Roll on the strength of hearing that song in the ad alone, only one of them was a bit of a Fall fan already. As others have mentioned, any kind of exposure for artists who would otherwise have trouble being heard has gotta be a good thing.
We all take our music seriously on here ( p'raps too much at times ) and get exposed to lots of different things but that isn't necessarily the case for others. It doesn't surprise me that sometimes obscure music when given mainstream exposure strikes a chord with a surprising amount of people. We've all got ears and there's no escaping the good shit !