They can do that, nothing stops people from setting up co-ops today, I've been in one as well in fact. But at the same time, if I'm making something lucrative, I'd want to profit from it. That other people I hire are willing to work for the wage I give them is their problem, since if they don't like the wage, they can always go elsewhere (given that they are skilled workers, not workers who can find no other job in some company town or something).