What are the advantages of puppy mills?

The pros;The person running it might make money. That's a very little might, though, as there's a huge risk in the dog breeding business and if you are giving the pregnant dog and her puppies all the proper care, you are most likely going to end up breaking even or loosing money. Puppymillers, however, do NOT give proper care to their dogs and puppies, and thus end up gaining.

They tend to be cheap and inexpensive to puppy stores.

Cons:-The person running the puppy mill is at a high chance for going to jail or getting a ticket due to neglect and often abuse. Puppymillers often end up with more dogs they can handle. This leads to dogs dying of starvation and rotting in their own filth. Puppies tend to be very sickly, and there's a high doggy Death Rate in puppy mills. Puppies are often very under socialized and are at a high risk for growing up with severe behavior issues such as aggression or extreme fear.