They burn their listeners out on their overplayed songs by limited artist. Last time I had it a few years ago at about $5 a month I canceled it. Between the same songs over and over and the stations dropping out driving through the hills with trees overhead it wasn't worth the hassle.
My radio has a CD player, USB Ports, and bluetooth I can link my cell with, so I convert what music I want from my CD's left safely at home to MP3 then put them on a thumb drive and no more Killer Queen, Bohemian Rhapsody, Doobie Brothers, etc that that are on at least three stations. Willie Nelson has a decent channel and last time I listened a decent mix and variation. To be honest I don't even listen to the free previews any more.
They're not aiming for someone has time to sit and listen. They're targeting working commuters in target demographics that advertisers want. Some of them are driving for less than 10 minutes per trip. The music is meant to be a filler in between the advertisements.