[cucumber3732842]

There's this giant no-man's land of more work for less profit they have to cross between "reliably profitable business run by its founders" to "reliably profitable business with a half a dozen or more employees". A helper you can keep tabs on but can work without often pencils out. A crew of 2, 3, 4, that's often less profitable per hour of the owner's labor (with a way higher labor minimum) than just working yourself or with a helper. Only when you have things humming along do you actually make more money than if you were working on those task yourself.

You almost certainly have to take out huge loans against the business to get across that gulf (your employees need those capital investments that you use to do your work). When you consider the long term outlook and the age of most business owners making such a decision it's no surprise that many choose to simply stay small rather than take on a huge amount of work and stress to maybe make more money years in the future.

Basically there's a ton of work for no reward between "I own my job" and "I own a business"