I thought about going belt drive with my most recent bike purchase - I picked up a Giant Seek 0 2014, which is IGH chain drive. I could have gotten the Trek Soho with the same hub but belt drive (and mechanical instead of hydro brakes) for $200 more, but I decided that given that it has a chain case, I don't really care that much. With single speed, there's no reason in the world why the chain won't last 10,000 to 20,000 miles without much attention.