Not to take any side, I just like to give you a different perspective.
I an a little bit of a control freak. So I perform all my lab work up till processing.
My lab guys never have a problem with that, and most tell me I cannot pay them enough to wax things to the amount of detail I need (festooning, custom rugae, etc) and just charge me to process. I never question their charges - in fact, often call to tell them they missed charging me for adding the patient ID, etc. They generally appreciate that, and I am happy to pay them what they want to preserve my borders and anatomy: it is usually about $225 (thereabouts) to process and finish 1 unit, add pat ID, polish, and return ship. I do make all my measurements and select my own teeth, researching material combinations, shade etc. (One word about Ivoclar - if you are using Phonares - make sure you have the Phonares shade guide. There is no good conversion from the Chromoscop to the Vita line at all.) As such, they extend me the lab price since I am functioning pretty much as a lab - I create my diatorics, etc on my own. As such, if the DDS simply provides the teeth, there is still a lot of work at the lab end to prepare the teeth, remove that silly crescent (Dent_ _ _ _ you know who) or the interproximal seam left over from injection modling process before they can be used in the set up and should be reimburse as such. Goodness knows how many times a partial is so limited in space you end up trimming tooth down so much you need a new one, or the one you are trimming flew into that suction unit you just cannot open up. Maybe you can take the 'cost-of-goods-sold' factor out and charge the difference? I hope you don't feel all DDS are out to get people in the labs.
Just my 2 cents worth.
LCM