The entire cost argument is lost on me. I spend what it takes for me to enjoy my bikes. I don't have any carbon fiber yet because I haven't seen anything that would increase my enjoyment. But my dyno lights give me nothing but pleasure when I need then, same thing for indexed shifting and disc/drum brakes. I could own a single walmart bike with a flashlight and get by, I choose to own 5 bikes, optimized for me, suited for whatever I'm doing that day. And 3 of them have dyno hubs, my 2 commuters and my mountain bike. Some day my road bike will have one, haven't decided about my fat bike....