Except that some people just cruise through threads to give neg rep to people and then it has nothing to do with karma.
Same, I return neg reps always. To be fair that's because mostly everyone I have ever had have been for something really childish.
i reciprocate neg rep, cos i'm petty like that throw positive rep around like confetti cos i'm lovely like that :sunny: and (rep wise) ignore anyone in the silly "rep club" group cos i'm a twat like that :mickey: