People collect stuff.
And those collections are important to those who build them up over the years. They are cherished, shown off to friends. Trips to trade shows and conventions focusing on one’s favored hobby are planned months in advance. Life revolves around collecting more for the collection.
Coins, baseball cards, train sets, stamps, comic books, beer cans and so forth. One guy I knew collected toy John Deere tractors. A great friend of mine collected old fishing lures, but only from 1920-1940.