How many people edit their own Wikipedia articles about themselves?

I am an administrator in catalan wikipedia and I can assure you there is a lot of people writing about theirselves. And not only about them, also about their parents, their music group or their organization. Some end speedy-deleted, some others remain but get neutralized and, sadly, some remain with some bias (but with warning tags) in the encyclopedia.

I suspect that many, if not most articles about people have some contributions from the people in the article.  Wikipedia's rules are not completely against it, either.  The main rules are notability, verification and neutral point of view.  If a person edits an article about themselves, but really understands what 'neutral' means, they should be able to edit all they want and no one will object.  The problem is that few people can be detached from themselves and their own stories enough to satisfy critical editors.  A good lawyer can argue either side of a case.  If you can do that about yourself, you can edit your own page, no matter how the rules (which acknowledge your self as an expert about yourself) are interpreted.  In the end, no one knows the answer to this question, because all editors can conceal themselves behind a handle (nick name) and the rules are against "outing" (revealing the name) of an editor.