I recently edited a closed question by another user, in an attempt to reopen the question. For that I had to somewhat modify the question, by removing fluff like 'please answer this' but also adding some context, which was added to my taste. After my edit the question got a downvote. It is plausible, of course, that the downvoter downvoted because of my edits. Not only do I not get punished for that, I still keep my +2 from my edits, and the OP got punished.
For major edits, shouldn't the editor also put reputation at stake?