You all make very good points that fully custom bikes might be necessary for the minute % of riders who are unusually built. However, most people I've seen riding custom bikes aren't physically atypical, and I'd bet most ride custom bikes for the same reason other people wear a Rolex and/or drive a Lexus: as a status symbol. Sure custom bikes are nice, but totally unnecessary for the vast majority of riders. In most cases a custom bike is simply extravagant.