Honestly, while the idea is nice in principle, it can easily be abused, much like the "warn" feautre in AIM, which eventually was axed do primarily to immaturity. I personally have my rep disabled because someone blackmarked me because of a difference in opinion. While I'm vain enough to hide the glaring red, I'm not too vain to go trolling for points with clever or witty posts/replies in every new thread just to boost it up to green. But I'm close....