The "Henry Ford" concept. He once suggested he could give cars away and make a good living just selling the parts to maintain and repair them.

As a former cost analyst for various production firms I can tell you the bother and nuisance of keeping a record and inventory of parts for past and current production models is not cheap. They're always in the way and prone to loss or damage. And if you want to make a few extra you have to shut down a process, tool up for that part, run the parts to spec, and then store them(?). It's a nuisance. Floor space is expensive for most operations.


Parts out your lawnmower sometime. It would cost six times what a complete mower did/does.