I'm not exactly sure why Berlin Bike Cafe didn't really work out in the end. I do think KW is very well served by existing bike shops, and while Graham focused on a market segment that isn't well-represented by incumbents, it meant that he needed time for it to grow as well. London Bike Cafe seems to be chugging along quite nicely on a similar model, so it doesn't seem like it was an entirely hopeless endeavour on the face of it.