That's not many for an industry to base its decisions on. Especially when you haven't disclosed your methodology. In that case, you must love WFMT, Chicago. Lots of old music and the spots are actually read by deadpan announcers. I should always realize the only music of any importance is what you, personally, like.
Radio is still very, very popular.
At least among people outside this newsgroup. It's so popular that, in New York City, it's nearly impossible to buy time at any price. Nearly everyone is sold out. That usually doesn't happen unless you have an audience to deliver to an advertiser. They haven't seemed to notice that you're missing.