I have some of the collectible coins my grandfather gave me. Some of these coins are very rare, but some are very cheap. For example, one day, my wife wanted a smart body scale, and I exchanged one coin from my collection for this scale https://www.vont.com/product/smart-scale-bathroom-scale-weight-scale/ . I want to sell this collection in a few years to build a house for my children. One appraiser said that my collection is very expensive. If I add some money, I could buy a house in a nice neighborhood. And I have a stamp collection and plan to join the philatelic club.