Another thing to consider is image. The high end custom gunsmith has his name on the pistol, and if you pay $X000 for it you'll no doubt show it off. If a person has bought into the hype on flgr's and saw one without it, that might have a detrimental marketing effect. Or the guy only stocks flgr's because that's what most folks want, and be saw no need to buy a standard one special and disrupt his workflow etc.
Tuner, I'd love to see a more in depth discussion of magazine feed lips, if not here then in another thread.