You may be right that this would work, and I'm aware it was originally proposed without curation rewards. My concern about having no curation rewards from an incentive point of view is that now bad actors would be incentivized to upvote comments from their sockpuppets because they no longer can profit from curation rewards aspect (which normally acts as a potential magnifier on their reward if they vote for stuff other people like).
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Personally I don't think curation ever discouraged users from using their vote to upvote themselves. It's one of the perks of having steem power, and we already see it frequently used.