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The losers here are the bidder and the seller via curation rewards - the seller also doesn't get a return of Voting power to 're-sell'.

Bot owner still keeps their SBDs.

What I mean is that the seller could sell the vote again, maybe somewhere else. Curation reward once, selling the vote twice gaining profit from two sells. Does that make sense?

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Oh, I was under the assumption that you regain VP when unvoting and thought you could reuse it on the same or another post. If that's incorrect it doesn't make sense indeed.

It doesn't allow you to "double sell your vote." Your vote power remains diminished and you forfeit your right to the curation reward. By unvoting, I simply sacrifice that vote power and curation reward. When you unvote, that potential reward is returned to the rewards pool for more appropriate distribution in the entire reward pool's 24 hour period.