It's related to the demand. That's why unique things might not be scarce especially when there's a lot similar things.

That's why NFTs are not scarce even though they are unique.

Personally I would also wish that billionaires kept their wealth in things unrelated to the real world. Because when they put it in the real world they hike up the price for everybody by creating illusion of demand that really isn't there because they won't use what they bought.