Lets see. My story begins last August. Back then I wasn't even a Halo fan. So I guess out of some random chance I was browsing the web when I found MjolnorArmor.com. I started reading into it, and then about Halo and the story, and I liked it. So then after lurking around the forums for a few weeks, and after discovering the wonders of pepakura, I realized "I could do this if I wanted to". Then I basically told myself "No don't do it, its too much of a project", but I still knew it would happen sooner or later. I picked sooner and next thing I know, I have layers of superglue on my fingertips and a fully assembled H2 left forearm. That was a good feeling.
Ok, so that was a bit of a tangent, but to answer the thread's question: Because I (and we) am a Halo fan. We're on a different level than the weekend warriors on XBL. Just playing the games isn't enough, you gotta live it. Thats why I make armor.