1. Professional means you make a living off it. If you have just won a few cash prizes here and there, then you are an amateur. I highly doubt you could live off Halo tournaments alone. And if you could...it wouldn't be a living I'd desired.

2. You also aren't in the majority. Some of us play it for fun, and so far it sounds pretty damn fun to me.

3. What is wrong with 12v12? It's not the only way you can play, as that would be suicide to require 24 people for all games. I find it to be a boon.