I rarely see people doing this so i figured I'd pass it along...
Part of the Ilum "capture the points" is a stacking "War Effort" buff, capping out at x5.
http://i.imgur.com/xdVOE.jpg
The buff does 2 things, 200% more valor from ilum kills (you get 10v per kill, 30v with a max buff) AND +200 valor on Warzone completion (Win or Lose, you still get +200). the Buff lasts 30min. You don't see the additional +200v on the scoreboard at the end of the game but i confirmed it silently adds it when you leave the finished WZ.
Naturally this works better when more people are on but i will que from Ilum after getting the max buff and play a WarZone. After the warzone is done i generally have ~10-15min left on the buff (HuttBall and VoidStar are both set times, civil war can drag on a little more, but I've never had one last longer than 20min). It is possible to stretch out 2 games in 30min if they are quick, but you run the risk of having to start the buff over if it falls off. the buff does need to be active at the end of the game to earn the bonus valor.
Once the BG is over you either have to kill someone in ilum or be a part of a point capture to refresh the buff to 30min again. After that it is rinse and repeat. During peak time at night i've never had the buff fall off because the nodes are constantly being traded. I generally lurk between south and republic base since those are generally the most active.
+200/game will average out to a very nice valor game, especially on those games when you join a losing game and only have a few min left, this makes it worth staying for.