It is WAY more common than people like to talk about in the conformation world. Yes, most breeders are small and their animals are beloved family members. However, go to any region and there is at least 1 big breeder who has 20-40+ dogs that meet the breed standard, do well at shows, and maintain a wait list. They either have a small staff or they maintain their dogs to a different standard than the average small breeder.
In miniature schnauzers we have a few big breeders on the west coast who are independently wealthy. They maintain immaculate facilities and full time staff. They have a lot of dogs but produce VERY high quality animals. We have some local people who fluctuate between 8-15 dogs but maintain good standards of care and individual attention.
Unfortunately, in my area we also have 2 breeders who mass produce. The dogs win at specialties, are campaigned in the top 5 each year, but I know that the quality of life for all but the chosen 1 or 2 is horrible. The class dogs have pee-stained legs, the bitches are finished, shaved, and then immediately bred 3-5 times, and then placed, and the dispositions of their dogs are meek and timid at best. I hate that the industry has people like them and that their dogs from the outside are often credited with being some of the nicest in the breed.
I firmly believe that high volume, high quality kennels exist but it is really hard to do it right.