So was there really a problem sourcing these from outside the company, or is it just being a cost advantage and maybe to ensure supply? Other film makers don't seem to have a problem getting cassettes.

Would it be possible to make reloadable snap cap or scew on designs rather than crimped and sell them for bulk loading? Especially if they were available in different DX-codings as those are kind of hard to find now. I think only ISO 100 DX coding is available.