Agree with Utopian to a point . . . My car is unique, as it is outfitted in a fashion I chose. Others will have selected different options. Does that make my car "custom"? Hardly, despite it's unique nature.

Uniqueness is only part of it. I think the more important part is the input from the purchaser. Like Homer Simpson's car, I may know what I want in a razor, but I do not have the skills to make it a reality.