My brother-in-law is a blue collar man, he has a high-paying job in road construction and also owns a number of rental properties. He does most of the work himself so if a tenant has a water heater blow up he will replace it himself, he has friends who owe him favors so he can get low-cost help too.
If you are flipping homes yourself you will do it on the same basis and work for equity. If you are a corporation you're going to (1) have to hire people to do the work, and (2) probably hire some supervisor to drive around in a $90,000 truck to watch the first group. They all get cash before you do.
The individual home flipper working out of their own money is going to only choose projects that look very favorable. The corporation is going to hire a manager and that manager will probably be told to close a certain amount of deal flow and will feel pressured to close deals that aren't very profitable and not have such a financial incentive to keep the deals profitable.