"Will work for free" could replace "will work for food" on sandwich boards.
Currently, that's one of the most effective ways to get a job or a better job, attract new business, hold on to current clients, enhance a brand name, and generate publicity.
This isn't entirely new. For years lawyers have been doing free or pro bono work. Lawyers still are, only more of it since the legal balloon crashed. Unpaid internships have been standard for both undergraduate and professional students. And whom do you know that hasn't volunteered in a political campaign?