In my limited knowledge of breeding......(my MIL bred Great Pyranees for many, many years)
 
Anyway (IMO) breeding is very expensive as it is and so in order to make a profit they'd have to charge outrageous prices.....like more than just the medical costs and time taken off of work to care for the mom and puppies, which is great to begin with. 
I've been told by breeders that it HAS TO BE a hobby b/c at best they hope to break even when everything is said and done. 
And if people are breeding strictly for profit, that would mean skimping out on medical bills, checkups, etc (probably) and having lots of dogs JUST for breeding (not for love) and then that would become a puppy mill more than anything. 
And we ALL know how we feel about PUPPY MILLS  
 
 