Sorry, but installing arch linux doesn't mean you are some computer master. You are just following instruction on a wiki. Anyone could install arch linux if felt like, and wanted to put some time into it.
Some people make arch linux their personality especially the forum.
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People also just get excited about it. Arch is a great way to learn how the pieces of desktop Linux go together. It's a learn by doing thing. People come out the other side really satisfied and can easily catch themselves up in a common fervor evangelizing the experience. It's in the same part of the brain religion works from.