I think like you, the reason is that there are very few people voting and those who do have the sp very low and that the price is for the ground, but if you could win something in a passive way, is that those who voted they had coin token, I leave a picture of what I have in token.

My vote is 0.01 with a vote of 100% but passively I am also voting if the creator of the post has those tags, this way I would be winning too.
This voting system is fine, but I think another approach is missing, but I'm going to give it another chance, I'm going to see what happens with people's votes with their tokens http://prntscr.com/q10bqk