Why do you have to make money curating his content? By the time you wake up everyone will already know the expected value of his post. In fact, others will have made their prediction expecting your vote to be added 12 hours later. The purpose of curation rewards is to quickly filter content as it is submitted.
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The purpose is also to endorse earlier votes. Early votes are voting on the post. Later votes are voting on the post and on earlier votes. That's why I suggest rewards for downvoting, but even the lack of an endorsement is sort of a punishment. The system is effectively zero sum to a large extent. If your early upvote fails to gain endorsements and other upvotes gain endorsements, then you are losing value even without having downvotes (facebook like or nothing model).