It's not like they are even making money off them. Shouldn't radio stations and DJ's and other people making money off music be sued first?
Radio stations already pay performance rights agencys a fee for the use of the music. I don't know how DJ's work around that whole thing, perhaps D-Frag knows.
There's also the argument that having places like this auto shop play radio stations help boost musicians' income – a customer might hear a song on the radio while waiting for their brakes to be finished and say, "Hey I like that song, I'm gonna buy that album!" It's free advertising.