The AvA is basically a DA with rotating plane sets, how often do squads go to the regular DA?
This is the reason. People who don't bother to participate anymore constantly feel the need to belittle it anyway.
Some of the best furballs I have been in have been when squads have clashed in the AvA.
Some of the worst gangbangs I have been exposed to were when AvA squads have refused to send 4 of their 12 members to help out the 2 on the other side that are getting ganged. I won't name names, they know who they are.
But all things being equal, I would just as soon squads were dropped from the AvA altogether. It might get rid of some of the silly drama if there are no perceived "sides" to defend when someone decides to act like an idiot.
Pick a ride, fly, and shut up.