Take a look at Failed to allocate memory: 8
I posted an answer. A few months later, a user by name the of aaaaaaaaaaaaaaaaa with reputation of 29 converted my answer (and all other answers for the same question) to a community wiki.
As a result, I lost a boatload of reputation (the answer has been upvoted 21 times).
Why does such a low-reputation user have the right to convert answers en-mass to a Community Wiki? Isn't permission limited to the author of the original post?