Maybe not really something valuable for "normies" but I have a lot of unused/boxed computer CPU`s (including some russian ones), I have around 40 IBM ThinkPads which could be sold for more than 400$ since they`re in perfect condition and are even packed in their original card boards, I have an 1988 Chevrolet Corvette in my garage which I use as my daily. Since it's an US import car, I bet it's worth quite a bit money here in Europe.
I personally hate modern cars since they have too much electronics for my simple a$$ brain and this car is simple enough for me to repair since I don't need any ODB2 devices or something called VCDS for deleting any errors : P
On the Corvette I can just open the owners or service manual and lookup anything. Even though I`m younger than 25, I just can't get along with most of the modern cars, except if it`s one of those simple Lada Niva`s or UAZ Hunter`s : P
Kinda funny because my parents always want me to buy a new Audi or some SUV because "they're worried about my safety" which is total BS but I always declined their offer because I knew that if they buy me one, I would give up my independence of working on the car by myself with my simple tools.