My current home is a newbuild and before I bought I looked over the plans for the whole development of 7 homes, checked out a dozen or so other homes and sites the developer built to see how the construction was, whether or not the developer was timely with delivering all the custom details he had promised, etc.
Funny thing is, everyone was real happy with his work, had nothing but nice things to say about him - and then two years after we moved in to our (very satisfactory) house he was sent up for tax evasion, leaving a number of people with half-finished homes.
I think the problem is what you alluded to--these folks are great craftsmen and think that translates into running a business. Then when costs go above their expected level, they head for the hills.