Which game featured the first documented major virtual property sale, when a player purchased a virtual island for $26,500 in real money in 2004?

In the gaming industry, virtual economies have evolved from simple in-game currencies to complex marketplaces worth billions. Brand positioning within these virtual worlds has created new retail frontiers where digital items can command impressive real-world prices. This trivia question explores a pivotal moment in virtual retail history that helped establish digital goods as valuable commodities.

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Second Life
World of Warcraft
Project Entropia (later renamed Entropia Universe)
EverQuest