I don't know the answer, but I'm grappling with the question of whether or not having a lot of Steem Power (i.e. a whale) makes you more qualified to determine what content is good or bad. In some cases Steem Power is earned through participation in the system, and by posting quality content you are demonstrating your skill at contributing, which may be a quality that would indicate you also have good taste for rating the work others; however, this might not always be the case and not all Steem Power was earned this way, especially some of the early adopters who became whales as a result of getting in early or getting lucky.