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That's one approach. I'd prefer if the overall split weren't dependent on the auction/penalty. That can be done by giving it to later curators on the same post, as suggested in the OP, or I think better by keeping content and curation in separate pools according to the specified allocation (be it 50/50 or 75/25 or whatever). Any penalty on curation of one item would slightly increase the available funds for rewarding curation on others.