If one adopts the concept of many different karma thresholds, then it becomes trivial to say that only users with X karma can upvote. Set it to some modest leve

If one adopts the concept of many different karma thresholds, then it becomes trivial to say that only users with X karma can upvote. Set it to some modest level, and when they hit X karma, new legitimate users will feel rewarded for their contributions! I agree that there will always be gaming strategies. I just think that having gradually increasing rights/priveleges at quick incremental karma steps is a good way to combat spammers.