The photographer I worked with when I was doing colour printing offered both commercial photography and printing services to other professional photographers. I did most of the machine printing, and he did most of the custom enlarging.
One of his best customers was a chain of restaurants. He had shot (on 4"x5" colour negative) photographs of each menu item showing the preferred layout of the food items on the plate. Each kitchen in the chain needed a full set of those photos for their food styling manual. Every time a new location opened, or an existing location's photos suffered some deterioration (restaurant kitchens aren't the best places for colour prints) my colleague would receive an order for another set of 8x10s from his negatives.
If our machine printer had been big enough, we could have used it, and made more money.
4"x5" film is/was used for volume work too.
By the way, you can switch formats on those machines without taking out the roll of paper. You just need to be able to change the lens in the dark.