Karma for Zerker Warriors
pow/tough/vit gear exotics for those rare moments when you dont want to get instagibbed by every class and its mother? there is karma dealers in the high lvl zones that deal with those types of gear: http://dulfy.net/2012/09/08/gw2-templegod-karma-armor-sets/
Now, if I were to buy exotic gears from the karma vendors, do they automatically soul bound or am I able to transfer those gears to another character?
Soulbound to the character. You can´t transfer the gear or sell´em over at the BLTP.
You invest the karma in going for a legendary or having more than 1 set of gear (with different stats). Berserker gear is good for most stuff, but I do love having the option to switch to a defensive set should the need arise.