Another abuse of the vote kick system I have seen is that players who think they are exceptional and shouldn't be in a group that fails once ask the group to be kicked so they get around the DF lockout for leaving the instance. I for once never vote them out and love when they get mad about it lol.

For me it is just no reason. U wanna leave because you feel superior to the group and can't be arsed to be in a group with lesser experience that needs several attempts? Don't do DF roulette but use the Party finder. But don't expect to be able to disband the group without getting any penalties like it is the most normal thing in the World.