not really possible, greed and best interest for community does not go together in whatever combination.
who can imagine a whale that is selling votes or just selfvote, looking through steem posts to find good content? I can't.
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This is exactly why tweaking curation and author rewards and splits won't work. Nothing makes curation - actual curation for content quality - more important to substantial stakeholders than their stake. As long as profit can be extracted by corrupting curation for financial maximization, @therealwolf will do it.
We need to eliminate mechanisms that create financial incentive to corrupt curation completely. Tweaking them won't ever work. We need to create a dividend stream from funding development of Steem and the ecosystem that will provide better profitability to that ilk, while making curation unsuitable for extractive profiteering.