"Some have already acknowledged it, but we all must remember that a press release IS NEWS."
So it is cool to change all the links in those press releases to nofollow, right? Because after all, press releases are for NEWS, not for page rank manipulation.
So for instance, the SEO company who have a press release on your site for their tool, which finds blogs with DOFOLLOW links allowed in their comments. They won't get mad if you change the link from their press release to their site from a dofollow link to a nofollow link, will they?
(Hint, search for "dofollow" in your search bar if you are not sure which company I am talking about.)