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).
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