I think it really depends on what they are doing with these puppies. Are they only breeding to supply a demand for pet puppies? Or are they breeding to keep thier next up and coming show or performance puppy? How many show quality puppies are being placed in show homes? If the breeder is keeping puppies back are they working with them and showing them? Or just raising them to breed in the future?
There are small scale breeders and larger scale breeders. It's not uncommon for a big name kennel who is very successful in the show ring to have 6+ litters a year.