When scarcity turns items into status symbols, mystery mechanics become one of the most effective ways to monetise them. But most crazes fade. The difference is utility: items you can price, trade, stake and cash out. Counter-Strike shows what happens when that utility takes hold. The free-to-play shooter lets players buy, sell and trade cosmetic weapon skins in a market now worth US$5.7 billion. You'd assume gamers drive that number. Much of it comes from gamblers, traders and speculators more interested in price action than headshots.