Most of it isn't actually that expensive. The examples in the article are extremely rare or perfectly mint copies of very old games. A rare unopened copy of SMB sold for 1.5 million but that doesn't mean a loose Mario bros/duck hunt cartridge with scuffed label is worth more than $5. Same for some of the old computers i have in my attic, they are worth something but still sub $100, barely worth the effort of going through the trouble of listing and shipping them. Never mind storing them for decades.