U folks act as if the future is not knowable.
What has happened with pre 1972 Ferraris? They became very collectable, much like a piece of art. There is a global demand for these cars, they are iconic of a now bygone era. Vintage Porsches are very similar in cache. U might now say that Porsches have caught on (been recognized) and it will NEVER be the same again.
The immediate question vs the long term question is, has the vintage Porsche market become speculative or is it merely price meeting a new demand curve? One thinks that at the moment the market is seeking a new equilibrium at a higher price basis. Porsche is recognized as a high quality product in an increasingly disposable product world. Therefore it will be sought after and the more rare the higher the demand. Vintage Porsches are being seen as a hard asset investment much like art, spoons, coins, stamps, and other assorted antiques rather than just another used car.
Do U folks realize vintage shoes are becoming collectable and there is a global market for them?
Of course Americans are the last to know....