I do. I EARNED that karma by threatening Leon Medoros'(sp?) life. It also shows that karma is pointless. Also, I only pay attention to the positive karma. Typically, I can figure out which post earned it for me. That helps me know if somebody learned something to help them or just put a smile on their face.
As stated a looooong time ago, if you have an issue with someone's post and feel the need to give them "negative karma", man up and write a post saying why. We can't learn if people aren't willing to explain.