I've never purchased MTO or bespoke. Good to know.
Seems strange he wouldn't throw in the custom shoe trees at that price.
It would appear he doesn't have the "supply chain" to make it happen. Traditionally, the lastmaker is in house, and makes your custom last and stores it there. I guest then either that lastmaker or an outworker tree maker creates the tree based off that last.
A tiny bit sketchy that he has to send measurements to a factory to have the lasts made, but not a dealbreaker so long as he is accountable for the fit of the shoe