No they probally do it due to arrangements the have concering Royalties. Also by doing that they can play more music and commercials to maximize profits. If speeding up their music gets to you, then record it on a medium and use pitch control. This has been done for years, for example KSMG in San Antonio when they were oldies would speed up Sugarloaf's Green Eyed Lady and the Billboard Charts 1970 CD would sound a bit slower (I used to think my CD Player was defective, but then discovered they change the pitch) Another example is KSAQ Q96 when they played Dee-Lites Grooves in The Heart (LP Version) back in Nov 1990 they speed up that song, but in January of 1991 when they played the 12" Version they played it slower than normal. I remember not having that complete song and I ended up taking the first part of the song recorded on Scotch Chrome 90 (1970s) cassette and playing the rest of the song recorded on a TDK MA 110 (1988) tape transfering that song on a Scotch (1970s) Highlander Blue Shell Cassette.
Another thing stations would do that bothered me was they would skip 20 seconds of a song, and shorten a over 5 minutes in length song down to right under 5 minutes. KTFM was notorious for doing that, so I listened to KSAQ.
I think the Beat 102.3 sucks they don't play Juvenille's Back that Ass Up, they play Back that thing up.
KTFM in 1999 played Back that ass up, 979 the Box played Back that thing up. So I quit listening to the Box, and listened to Satelite Dish Network Music Choices Rap, and Urban Beat channels.