There is a reason other social sites removed downvotes, dislikes, etc... It's just too negative for most people to handle. People like to go places that make them feel good. People will stop showing up here if it makes them feel badly, regardless if they can earn a few pennies. I think overall the free downvotes will end up doing more harm than good but that won't be completely apparent until precisely what you described here happens down the road. While trying to police the reward pool we lost sight of trying to grow the pie and make it appeal to more and more people. I feel we are doing the opposite.