The problem with Karma is that it is so undefined. Good and bad karma is given for disagreeing with an opinion, bad spelling or grammar, personal grudges, just for the fun of it, etc. Karma can be given for any reason, and therefore it has no meaning.
I personally would only give bad karma if someone is being rude or disrespectful - but that is so rare on this site.
The other problem for me is if I get good or bad karma, I can't see a way to tell what post the karma was for.
So, to me Karma is completely meaningless.