are you talking about Steem Power ?
or Steem $? because only steem power does get the 90% payout?
or did i miss something
in case you missed my post, have a look here
https://steemit.com/steemit/@knozaki2015/my-upvote-was-worth-5-06-usd-25300-or-how-to-earn-the-maximum-curation-reward