Funny, my guildies and I were talking about stuff like this the other day. Guilds like Paragon that have a working relationship with actual businesses, yes, I honestly think that listing their experience working with said companies and their efforts at teamwork and coordination could look good -- if it's to someone who's familiar with all it entails, or if they're given the chance to explain in a face-to-face interview.
If you're a serious recruiter for a serious company, you'd be a fool to not hear out your applicants (after the initial weeding out, of course, of unqualified applicants -- but, all things being equal ... if two people with a similar education and training pedigree come in, and one of them has experience with a working relationship with companies and can explain, in real terms, how they are able to unify people toward a single purpose, possibly having to manage disparate personalities, whatever that purpose may be ...)