Oh, crap!

I am so going to get a satellite radio. (I haven't listened to regular radio on a regular basis since about, oh, say, 1992.) While I don't generally like splitting the hairs of music into iron-walled subgenres, there's at least a chance that I could turn on the radio and hear something that does not suck. If I study the magazines and the websites, if I read critics and weblogs, I am able to find music that I want to listen to. Why is this not possible by listening to the radio? Wouldn't you think radio would be a natural medium for listening to music? Why has radio been in a deep, everlasting suck since, say, 1978? (Give or take 6 years.)