True but the incentive system which gives people points for content tends to create an environment where people try and say what is popular or will get high karma instead of what is insightful and avoid what is unpopular or will get downvotes even when it is true and insightful.

Tying a system for surfacing high quality content to individual points seems like a recipe for disaster. I like facebooks system, where points and algorithms work together to try and surface content that users will like, but there is no actual running point system to try and game.