Rap On The Radio

There's a radio station in DC with the tag line, Today's best hits, without the rap. My question is, in 2014, what is the problem with playing rap on the radio? Look, no one expects this station to abandon its current play list of Katy Perry, Maroon 5, OneRepublic, Bruno Mars and Lorde and start playing Wu-Tang Clan and Odd Future. (You didn't expect an Odd Future reference from me, did you?) However, would the audience revolt and the universe explode if the station included the Juicy J portion of Katy Perry's Dark Horse? Are they worried about losing sponsors if they played Same Love by Macklemore?

Meanwhile, one of this station's competitors (who plays virtually the exact same songs) recently changed its tag line to All the Hits and are slowly figuring out this rap thing. Although they also seem to be against Juicy J too, this station is okay playing the T.I. portion of Blurred Lines and Ludacris' rap in an Enrique Iglesias song. They also play Drake's Hold On We're Going Home since Drake sings rather than raps on this song, so I guess that makes it okay.

Any thoughts on this or am I simply listening to the radio too much during the day?