This warrents the question what you would need 200 holders for...
For 400 sheets of film!
Back to the serious stuff, we had about 300 DDS holders for about 9 4x5 cameras in various studios in our complex, we were always running around trying to knock off holders from others to have as many as possible for our work.
If you are shooting product photography, you are usually not surprised by the amount of film holders required. However, if you start shooting fashion stuff, you can really start going through exposures and somehow you never have enough loaded DDS to hand. The dip n dunk C41 and E6 processors, could take 6 x 4x5 sheets of film every 3'30".
We sometimes had two people continuously loading exposed film on a big shoot in the dark onto the racks, with another two people re-loading film in a darkroom and runners literally running to the studios with freshly cleaned and loaded film holders to keep the creativity of the grand lord and master on the boil. Sometimes the grand lord and master was normally referred to as a photographer, but on days when we shot fashion, they were treated almost as a deity and were sarcastically called grand lord and masters.
Seriously, I do agree with your question, would love to know the answer.
Mick.