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In fact, it does regain very slowly, but taking into account that the payout is in 7-day period. it regained about 50% in 3-4days. For say, even in whale's situation would not the payout go up even its 1 of 50 votes or 100?

In theory I assume it could, it makes sense anyway. But for it to be drastic enough to mean anything and show much of a rise, either that whale would have to be the only vote, or the biggest.