There's a shop here called Bike Fitters. I think their model, at least originally, was more trying to sell service rather than bikes.

I'd take it one step further, and really focus on the service, and set the pricing up, so you're paying for the service, and buying the bike from me would be secondary. i.e. we'll fit you on what you like, and what works for you, whether you buy it out of our inventory, we acquire it for you, or you buy it on line or otherwise.