I hate quitters. Had a 50 quit before 1.1 because he was one of two 50s on the team. We won the huttball match 6-0.
Got into civil war within the last 2 min, guess someone quit. We lost, marginally (it was 60-20 when I got in). I still got 12k xp. Why would you walk from that?
IF they put a penalty it should cut xp/commendations/valor/credits in half for the next warzone or for 30 min. If you can't take half spoils on the warzone you quit on, then you can take it on the next or wait 30 min.