[ty6853]

That's not how one off man and a truck builds normally work. Its usually only viable as a business when doing owner/builder on your own dime then flipping it and repeat. Clients don't want to wait years for one man, nor will banks, but someone will almost certainly buy even a half ass built house upon completion.

Sometimes you also see tradesman do this during down seasons, as it gives them a steady flow of stuff to do that they can complete almost as slow as they like then flip when done.

The buyer likely won't have any insight into the personal motivations of the builder, or what bothers them.