On the other hand, people who buy high-end bikes are very likely able to repair and adjust the bikes by themselves, so they will never set foot on an actual store. It's precisely the daily commuters not interested in bike mechanics who would need and appreciate the most a physical workshop. Not the sporty types! For example here in France there is the Cyclable line of stores [1] that are very explicitly
not targeted towards the sport of cycling (you won't find any lycra shorts nor carbon frames), but to cycling as a means of transportation. They seem to be doing quite well. The bikes that they sell are also quite high-end. I tried to go there this summer but the first time I was turned down as I did not have an appointment!
[1] www.cyclable.com