Just watching the most recent Workshop tour.
It is clear that Adam has run out of space to display stuff and is very invested in his collection. It is also clear that he likes showing the collection to other people and that people might well be willing to pay
It wouldn't make any more space in the shop of course because new builds would replace them.
If an audience developed, you would probably find film companies offering to loan, possibly gift screen used props for marketing.
@hallam: would soooo pay to see this...