Sheesh.
I'm Gillette. I make razors. In order to let people know I have a new product, I send out a bunch of freebies. Of course, I'll never make money if I give it away free all the time, so I have to charge sometimes too. It's up to me when I charge or give them away.
What people around here are saying is that, just because you're allowed to hear something on the radio without paying for it, the music should always be free. You should be able to open a business that profits from that music without paying for it.
Just like any other business, it's my choice when I give away my goods or services gratis and when I don't. And copyright law makes it pretty clear that public performance of these materials is not one of those gratis moments.