Blizzard caused a stir earlier this week when it announced that its highly anticipated Diablo III would incorporate real-world transactions in the form of an in-game auction house. Traditionally, players of the genre-defining game have collected powerful, rare, and otherwise helpful items such as weapons and armor by killing the monsters in the world, which drop the goodies at random. In the previous two games, an economy nonetheless formed around selling desirable loot on Blizzard's online community Battle.net or with more risk through third-party trading sites. The studio has taken an "if you can't beat them, join them"...