What second-hand things will become more and more valuable?

If anyone has a celebrity calligraphy and painting collection, or Tang and Song ceramics and other artifacts. Or do you have antiques like Qin bricks and Han tiles? If these things are collected at home, they are priceless! Even the rich can't get rich. So antiques and old rotten bricks are very valuable. But few people can think of it! Things are rare, it's the same at any time! The less things are, the more valuable they are, because none of us have them!