Perhaps for the beginning collector such a thing would be useful. However after years of collecting I really have to say that how badly I want it is the a price guide for me.
I think a price guide might reduce the learning experience for newer collectors. Only those outside the community of classic bicycle collectors would benefit very much from such a thing.
If one of you folks has a lot of time on their hands or wants the credit of being the author of a price guide, great. To my view, though, such a thing would not be as useful as Lou's Used Bike Guide.
Perhaps this an elitist view on my part, but it is my view and here it is.
Lansing, Mi USA