Existence ≠ Notability := Bad editing experience.
Fragment of a discussion from Talk:May 2011 Update
Well, I'm not convinced that we don't already have some form of CV-space on wikipedia - actually every registered editor has a user page, as well as a talk page.
The point I was making is that notability as a reason for exclusion is a great way to upset a lot of people who enter into the WP world. Actually, the requirement for RS as well as an avoidance of COI should be enough to prevent self-authored vanity WP Pages.
Likewise, I know of plenty of people who do indeed have WP pages. Lots of publishers now actively encourage new authors to generate a WP page - the publications model that WP is currently obsessed by implicitly encourages such activity.