[nraynaud]

And people karma-whoring on your question. Nobody has the answer, but your question has been edited 10 times.

[Shog9]

Every edit "bumps" the post, giving it a bit more visibility.

Some folks, upon encountering an unanswered question they also want an answer to, will do some quick copy-editing just to try & get a few more eyeballs on the problem.

[davelnewton]

There's only a specific group of people that "benefit" from editing questions. Most edits are an attempt to make it even slightly better and/or clearer in some way.