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New conclusion, maybe we have to live with that, it is similar in real life too, a billionaire has more power than a normal citizen. If it is acceptable for a minnow to upvote oneself than it is probably also acceptable for a whale to do that ;)

Cannot just another honest whale or bot downvote such blatant misuse?

At his own risk to get flagged as well?
Flagging is an option, but I prefer a system which prevents abuse as good as possible. One idea to reach that is my suggestion of the 'combined reward curves'. (I didn't say everybody has to agree with it.)

I didn't say everybody has to agree with it.

I agree, that was a great idea, which - as we now know - years later indeed got implemented.