biggest reward is probably that you defeated the other player, though on the other hand ganking an enemy player from stealth (element of surprise) or while he is half dead is no big feat. well you still get alliance points and stuff like that I guess

You're probably going to need to define how you're using 'ganking' first, since the definition I'm aware of (killing an unsuspected, not pvp motivated player) isn't possible here.

Seems the definition of 'ganking' is pretty flexible. Personally, I define ganking as a one-sided fight, usually with a low level or grossly outnumbered opponent, more often than not precipitated from ambush.

In that context, I would say it's not going to happen so much in this game because of the stealth factor. It's easy to avoid getting caught out.

As for whether you get points for winning a fair duel? Sure you do. If your opponent is capable, he's probably been alive for a while and he's worth more points that way.

OP you talking about this type of game play?

http://youtu.be/Sc65ItGnw70