From the little I know, if I have an account that has a huge amount of steem power my upvote to a small account has way more worth. People have accused Haejin of having an account always upvote him. I've seen a bunch of comments get posted on his page and he upvoted them. It was all from one account and it was comments like "hi" over and over. Idk what to really think, he is making a ton of steem though.