"There's nothing wrong with that model (as another commenter mentioned doctors paying into a "group practice" for shared expenses such as an office and billing staff.)"

Another common one I've seen is hair stylists. They often rent their booth from the shop in exchange for equipment, pay processing, foot traffic especially, and so on. They get some cut of the base pricing plus tip money. Idea is they'll come out profitable on a regular basis despite paying to be there. Just another business expense really.

" If workers are the ones paying the company, it's easier for them to agree not to have a CEO manage them."

Testing the comparison again, this is also true for hair stylists. They're the ones who have to pay to be there and maximize their revenue. They'd rather be left alone to use whatever methods they can to keep customers happy, regular, and with high tips. Likewise for a consultancy where people renting space in the company would want to be flexible to maximize number of clients and revenue by targeting methods to each one's or each group's preferences. Both for hair stylists and IT consultants this take experimentation that might not happen in organizations with top-down management, esp micro-management.