I agree, there should be some sort of limit to how much weight a whale can possibly have in voting to avoid abuse. Maybe not a maximum per vote like you proposed but some-sort of system that decreases vote values with regards to frequency of votes towards an user i.e. the more someone upvotes the same account the less that vote has value, this would encourage whales to vote different authors they support and not abusing the system even if nothing forbids them to create multiple accounts...