Which psychological retail strategy is most commonly used in gaming to encourage purchases of cosmetic items like character skins?

In the gaming industry, virtual economies have become multi-billion dollar markets. Companies carefully design their in-game items and purchasing systems using sophisticated psychological principles to maximize player engagement and spending. This trivia question explores one of the key psychological techniques employed in virtual item marketplaces that has revolutionized monetization in free-to-play games.

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FOMO (Fear of Missing Out) through limited-time availability
Decoy pricing (introducing an expensive option to make mid-tier options seem more reasonable)
Psychological ownership (letting players 'test' items before purchase)
Artificial scarcity through randomized loot box mechanics