I know a certain Hollywood fellow who paid to get his page written, massaged and inserted when he was up-and-coming. I didn't know that was a thing, but apparently some of the more well-regarded editors on Wikipedia take paid gigs. It's right there on their profile pages. I think some even list the pages they were paid to write. They're not technically doing anything wrong, they just know how to write the article and know all the rules for getting it through the editorial process without a hitch.

Here's an example of the tag the user has on their profile page to declare which pages they have been paid to write:

{{paid|employer=First Last|userbox=yes|article=[[First Last]]}}