Because most high volume shops do more damage than good IMO. They still use a wool pad on the rotary with a filler heavy polish spinning at 3000rpm's and flying over everything, trim and all. I've honestly never set foot in a high volume shop that does "good" work, and I spent over 13 years doing high volume. It's not like I/we didn't know back then that the work was crap, but we were given tool A, Pad B, and Polish C and 2-4 hrs to do a full detail (exterior, interior, engine, trunk...). The pads were always used way beyond their life expectancy but the shop owners were stingy and it was like pulling teeth to get them to pay for new ones. Extractors? Heck, most the shops I was at they had us pressure washing the carpets!
Times have changed a bit since then and with new tools like the Flex 3401 and things like Meguiar's MF system, I do think high volume shops can turn good (hologram free) work in a relatively short amount of time, questions is WILL they.
Gina, I know you have lots of state of the art equipment and have seen some of the great interior work your shop has turned out, but I think shops like yours are very rare, at least in my area they are.
Mind if I ask what your employees are using to polish the vehicles with (tools/pads)