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This is a small exploit, but I found that you can remove votes on posts that you edit.
So, you could use this exploit to gain 30 rep on the cap every day if you were motivated enough.
To reproduce, fine an old (down)vote of yours, edit the question, remove the vote. (Profit!)
*Edit*: This may not be able to be used as an exploit. But it still undermines the point for being able to remove votes on edited questions or answers.
Even if it works reliably, this has gotta be one of the more difficult ways to game the system. And it's hardly subtle: i'll often down-vote a bad question, edit it to improve, and then reverse my vote, but to do that on 30 posts a day, with the proper timing...
I can't help but think, if rep means that much to you, go for it. If your edits aren't harmful or completely pointless, who cares? May your extra 30 points bring you happiness or whatever...
Here's a hypothetical situation which I can't test myself (as I rarely ever hit my Rep cap) so someone else will have to confirm if this works:
Will you actually gain the extra point doing this? If so, this "exploit" doesn't really require removing an "old" downvote (which would require an edit first). You could probably just undo the most recent ones you made before hitting the Rep cap. Also, you would have to hit the Rep cap after doing your down-voting, otherwise you don't gain anything (as Bill mentioned in his comment on the question).
Ultimately, I'm not sure this is really a big worry. Anybody routinely hitting their Rep cap would probably be high-profile enough that others would notice them doing shady things like this and call them out.
I think the point here is that if you have edit ability on other people's questions, presumably it could be dishonest to change your vote on that question based on your own edit rather than someone else's edit. It's a little strange, in any case. If you thought you could improve it to the point where a downvote wasn't necessary, why not just edit instead of placing a downvote in the first place?
The exploit nature makes sense, too. Downvotes matter most on questions which are near 0 in their vote tally. If you go and find your own downvotes on questions which have been downvoted to oblivion (say -5 or more), or upvoted highly, then removing your own downvote will have little effect. The question will still have a ton of downvotes or upvotes, but you can get your shiny rep point back.
All that said, I'm still not convinced that the problem is big enough to warrant a fix. It seems very edge-case to me.
But if you downvoted something why would you want to undo it?
Just don't ever downvote and you have the same gain
(Or didn't I understand something?)
The behavior that you can remove or change a vote on the edited post is intended, I don't think it's intended to be used in this manner.
