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.
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.