Fakery?

[davidjackson]

Even as I read it, I was thinking Nostradamus. He was in it for the money. By extension, if the VM was a template document, it suggests multiple copies of parts were marketed.

Nostradamus lived in an age where printed material could be, and was, easily mass produced and marketed. 
The VM is from an age where material had to be laboriously copied and sold locally. Yes, there were scribe workshops who churned out study material for the universities, but they didn't work in whole books, just copying out and then renting the source materials needed for the basis of the courses.
The notion of creating a fiction for the mass market didn't, and couldn't, apply in the 15th century, it was impossible. 
Obviously, the notion of a once-off fiction for a specific unique purpose did exist.