Well, their vote is only rewarded if it's ratified by a bigger voter that follows them, otherwise they just waste their voting power. Some of them actually appear to be pretty good at predicting the posts that are going to be rewarded by later voters, which is exactly how the rewards are supposed to work.

If the concern is that they're being rewarded for content indifferent voting, the solution is for the people who vote later - with more substantial voting power - to start voting better... which hopefully is already starting to happen under the hf21 economics.