Could still be room for a win for people who are just exceptionally bad negotiators. Non-confrontationalists who can't bring themselves to ask for more and the like. Basically, a half-assed job by a professional, minus a significant cut, could still be significantly better than just taking a first offer or meekly saying 'Is that the best you can do?' and getting a token 1/2% bump.

Not sure if that would pan out, or that's a large enough target audience. Just a thought.