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The real power behind group contests is known to psychologists as "social identity theory." This theory has been most notably studied by psychologists Henri Tajfel and John Turner. This topic was also the subject of a recent blog post on
The Psychology of Video Games Blog:
"Tajfel and his collaborators theorized that people have a natural tendency to construct identities based on group membership. Part of who you are –and how you communicate that to others– is defined by what groups you belong to." One of the most interesting examples of social indentity theory from that blog post was the "Demoman versus Soldier" competition for Team Fortress 2. Whichever class scored the most kills over a given span of time would receive a new in-game weapon. If one doubts the power of social identity theory, one need only read the quoted soldier player's post from the Team Fortress 2 official forums: "Gentlemen, I have NO IDEA what this weapon is. I don’t even know if I’ll WANT it. But BY GOD, I know what’s IMPORTANT, and it’s that WE get it and the DEMOMAN DOES NOT."
Players will go to great lengths to win something in any game. That is well and widely known. Social identity theory shows us that they will go to even GREATER lengths to win something for a group they are a part of - especially if they win at the expense of another group they believe they are opposed to.