karma is given to people that is considet trust worthy i think

Vengeance

karmas a betch

the short answer is it's an outdated system.

My god given right.

Other players can give you karma after a game or by visiting your profile if they, for example, think you're cool or whatever.
You can see your karma on your profile, right below your avatar next to the blue ball.

Also, you can post now. ;-)