:btw, the "crap on the radio" as you call it is on the radio for a reason... it's good. If it was "crap" as you say it is, it wouldn't be on the radio...
It's on the radio because it's marketable. The record companies are into making money, and if they think they can push a mainstream product to the masses, they'll do that. They have this stuff down to a science, and sometimes the formula for making the most money isn't the same as making the best music.
It's really just like any other industry- McDonald's doesn't make the best hamburgers, but they're the best at marketing and pushing their hamburgers on people. Anna Kournikova isn't the best female tennis player, but yet she's much more marketable than Serena Williams. You're selling an image more than substance.
Sometimes the success of a product has nothing at all to do with the quality of that product.