I've been arguing most of this year that the rise of bid bots was because of the imbalance between curation reward and author reward, exaggerated by SBD premium. With actual rewards divided so unevenly, smart curators figured out how to capture part of the author reward.
I think the collapse of vote buying services in the face of SBD premium compression is strong evidence, but what do I know?
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Curators try to get author rewards, and vice versa, because humans are like that, not because they're "imbalanced." It doesn't matter what you set the numbers at, people will always try to optimize.