It is all about rarity, and place in history.
Some things are rare, and have no real place in history. They may be had for peanuts relative to an item that is part of the narrative of an era.
Thinking about guitars, any 1950s Strat is now worth into the tens of thousands. Some early Les Paul Standards achieve stratospheric prices, ironically.
I have no issue with that, nor the fact that many of them are now owned by non-playing collectors/investors.
Given the number of guitarists in the world, a relatively plentiful commodity such as early Strats have become unobtainable and hugely desirable.
This is the same pattern seen across all collectable items.
There has to be a reason relatively recent items become so collectible, perhaps it is useful to think of them as 'shares' in a commodity that rose massively over a short time.
For every one of these high price early MTBs there are others that are non iconic that can be had for relatively little.
Horses for courses.
Personally, I reckon if this Breezer ends up in a museum and never spins a wheel in anger again, it is no loss. Were it not around in a hundred years that would be.