YES! I worked at a radio station for about a year and even though it was a small station, the labels totally "did favors" and the DJs were totally expected to comply. I mean, hell yeah I will play that popular single if it means the label will make sure their musician stops by the station next time he's in town! I pretty much stopped listening to the radio after that though, just can't stand all same music over and over. I prefer my iPod in the car of Spotify. :)

The Doctor Who one was fascinating too, and I think it can be applied to many fandoms.