Problem is, if a couple of people get into flamewars, they then could be vindicative and start rating each others posts really negatively, and trolls would do this to everyone.
It'd be like all those youtube comments
well the rooster teeth version only gave you x number of points based on your community level so you could only award x amount of points and the only way to get more was to be awarded them by other users. not fool proof by any means but certainly more effort than most trolls should be willing to invest. of course there is no accouting for people with no life whatsoever.
anyway just a thought.
my video game art. in easy to read blog form. swing on by. laugh at my spelling.