I think that argument is completely morally bankrupt, and I think people know that when they make it. There's a very big difference between having a sincere, passionate interest in a topic and being a paid shill … Particularly for PR firms, it's something they should really very strongly avoid: ever touching an article.
PRWeek (30 Jan 2007) In response to suggestions Wikipedia might change policies to allow PR firms to edit the site without breaking a rule called "WP:AUTO".