Unfortunately scarcity is meaningless without demand. Lots of things are very very rare but have little to no value because nobody wants them.
As far as what is driving demand that really does not matter. As long as the demand remains high and supply limited then the price will remain high.
This is what is happening with Bitcoin. There are many different reasons people want to own some bitcoin today yet the supply is fixed so there is only so much to go around so you can guess what happens. The price goes up.
Maybe there will be a new found pass time of collecting Avon cars. You might be rich!
This is why I compare Bitcoin to Tulip bulbs. There was high demand until there wasn’t.
Pet rocks were a thing when I was in College.
Sadly, I don’t expect the Avon cars to be worth much in my lifetime. ;)