[AlexBucataru]

The way I understand down voting, it is meant to help clean up the conversation by marginalizing useless posts. For the most part, it looks like it is used correctly for that purpose. However, I have noticed a few down voted posts that were expressing an on-topic point of view, in a civilized manner. And that does feel like mob-rule censorship.

The "seeing the haterz" proposal would only be introducing another form of censorship.

The "cost for down voting" idea, on the other hand, makes sense and has been proven. It does give some disproportionate power to users that have high karma (their perceived sacrifice cost of one point is lower), but I see that as a meritocracy (they should be the most valuable contributors to the community to earn all that karma).