And besides that, it has nothing to do with "brains," it's about collectibility, rarity, and value.
If you own an item that is incredibly rare, it has value to collectors... so paying big bucks for it (if you have the money to spend) isn't stupid, it's smart... because odds are the value of that item will rise as time goes by. Think of it as an investment. You can invest in many things... stocks, coins, art... or collectibles. Nothing stupid about that, especially when you sell the item for a nice profit.