This is all from last season but,
http://www.arenajunkies.com/rankings/player/
look at all those alliance
http://www.arenamate.net/?page=1
58.1% alliance
34.1% human
and random bg's don't matter in an argument about PVP pros, do you think all those 2.5k plus "pros" continue farming randoms 24/7 after the arena season starts? They aren't really part of the general mass of players queing for randoms during the season. Arena's and RBG representation is what matters.