Back in the day, talking early 70's here, my brother worked for Honda (UK) in Power Road Chiswick.
Clearly having nothing better to do one Friday afternoon, he and a mate of his totted up the price of all the spares to construct a (then) current model C50.
They were astonished to find the total came to approx 2.5x the cost of a new bike.
Spares are not cheap, bikes, cars or anything else. If it gets to become unobtainium I believe it is best to be grateful that at least one provider has made an offering, no matter his asking price. You can always decline and go . . elsewhere.
My 0.02€
Kev