Semi related, is there any sort of service or type of professional that does mentoring/handholding of someone who has the core code that does something but who won't/can't take the steps on their own to make it a service or app they could sell?
But seriously, it does sound like a product person or sales person might be able to give you some useful direction.
But who'd be happier tending to the day to day of keeping their own service growing and running well than other kinds of employment.
In short, there's nothing in it for them except a hard to manage risk.