According to this answer on meta.stackoverflow.com:
Posts enter community wiki mode when one of the following happens: [...]
- The post has been edited ten (10) times by the original owner.
Typical answers on Code Review tend to be much longer than typical answers on other Stack Exchange sites, and so require more editing to get into decent shape. When an answer needs to be several pages long and contain hundreds of lines of code in order to properly review the original poster's code, ten edits start to feel like an awkward constraint.
[...] to discourage excessive bumping of questions. Every time you edit, your question is bumped to the front page, which you can use to get additional attention. The reputation loss associated with having your question made community wiki is supposed to deter users from bumping their questions continuously by making minor edits.
I'm quite aware of the 10-edit limit and so I do my best to avoid making unnecessary minor edits, but that means that I end up leaving typos and other small mistakes uncorrected for fear of "wasting" an edit.
So I'd like to suggest that the number 10 be increased on Code Review.