... rare gold coins of high numismatic value. It isn't irrational. It's betting on very, very good odds.
Take this beauty ... up 400-500% since 2021.
2021 Queen's Beasts Completer 1 Troy Ounce Gold Coin
In silver, up 1,000+%
And, these are "rare" new issue ... rare in the sense that the gold coin is extremely hard to find, and the silver version is scarce and very pricey. Collectors snapped them up and will hord them
semper ad nauseum.