Sometimes you hear about objects that are later worth a lot of money
I often thought, “If I had known that, I would have bought a hundred of them at the time!”
That's why I started my so-called Value Box. There I put things in, often new ones that I do not remove from the packaging and store at room temperature in a dark room (because of UV light) in a box, in a closed cabinet. My first object that went into it was LEGO, a Limed edition of Star Wars. I've had this for about 6 years, and there's more things in the box. Every now and then I show some of that. Maybe it's a disappointing value in the end, but I'm just guessing. You don't get anything in a savings account. Otherwise I always have a nice box of LEGO!