It should be an Opt-In and Out button. I think it's funny that people who say they want it as an option also voted 'No'. There really needs to be another option added to this poll. LOL
Like Kahara said earlier, Karma is just a way to stroke people's ego's, or to bash people who are usually undeserving of it, just because they don't like your opinion. So, it really should be taken out, because both of those can end up bad. If you let people get a big head, they get all high and mighty, which they aren't. If they get bitten a lot, assuming it was for no reason, then it's makes you angry, sad, and makes you want to troll. Not saying that people who get a lot of karma have big heads, and those who have little are trolls, but I know some people who do this because of Karma, and I've seen it happen. LOL
I'll say Opt-In/Out though, because a lot of people seem to like giving Karma, and I can make a compromise, I suppose, if people like me who want it removed at least have the option to turn it off for only us. Except I'm not sure if I'm alone in that regard.
EDIT: .. I just realized I posted twice, I didn't see it before. Oops. If a mod wants they can delete the earlier one, I really didn't see it somehow. :x