I agree, I don't think it's the best business model out there, but they are doing a heck of alot more than any of us are.
I think they have a great business model. I researched them a little for one of my marketing classes last semester. The charity thing they are doing is great promo for the company, and they are doing something to help out. Plus they are making a great profit on their easy and cheap to make shoes. They were created in 2006 and they are already huge. They are doing something right.