I dunno I like to PVP because it's fun to kill people. World PVP is still my favourite, just going up to people minding their own business and killing them. Any time, any place, any situation, any numbers. That's the best and most true form of PVP to me. I don't get any reward out of it. I don't get a title or a cool mount or gold or better enchants or some other stupid nonsense. I get the joy of killing people. I only even do Arenas (and RBGs) because I have to get gear to PVP in. If it didn't exist, I'd do nothing but play random BGs and world PVP all day. Forget your fair and balanced gameplay (HA, as if it exists lol), forget your chain CC rotations and unkillable healers that run around corners for 20 minutes. Forget all the boring stuff hailed as 'skillful' and just go out there and kill people. Everyone you see. Dude doing dailies? Dead. Group summoning for a raid? Dead. Guy buying stuff at a vendor? Dead. When PVP starts being about something other than the joy of killing people then you're probably doing it for the wrong reasons.
TL;DR killing everyone you see is reward enough from PVP