Thanks for your explanation. I thought it was just me, doing my own work as economically as possible, that saw rebuilding calipers as preferrable. However, when I think about it, if I were trying to turn some profit AND see that the customer didn't have to bring the car back, rebuilding them myself would provide much better quality control. If you see that a caliper is not rebuildable, then you get what you need. I guess it gets back to the old "if you want something done right, do it yourself" motto.
Thanks again for the insight,