I have a reputation of 60 and I do a 50% power up. I only have 185 sp, but I always upvote even if it is with 2 or 3 cents, the minnows. I try to encourage them to not give up on the platform. I have been on Steemit since 2016 and I would like to think I do post regularly but have only managed to get 185 sp. So sometimes it is not about the REP that makes the vote. But I do understand what you mean. I do also self vote, but really its only with a couple of cents. I know some whales with 74 rep who post approx 11 posts a day and he also self votes and rarely votes on anyone else, it is sad and I understand your frustration. I want to be a whale one day who does support many many minnows.