in reply to Increasing the Signal/Noise ratio of PM
I was reflecting on this the other day. I think the reputation/XP system cuts down a huge number of 'I agree posts'. Rather than having 30 'I agree' posts we end up with a node with a reputation of 30, which says the same thing and the author can feel chuffed about it. The XP boost is nice too.
I didn't believe in evil until I dated it.