No, all breeders are not puppy mills. I read your post about buying the $5000 puppy and I hope you will change your mind and get a puppy from a breeder who has a love for the dogs and not the $$$.
Please select a breeder that will allow you into her home and will let you see where the dogs live. You can also see the parents of your puupy at least you can see the mother. Sometimes the sire is owned by someone else.
A good breeder will ask you more questions than you will ask her. Good breeders care about where their puppies end up.
Did you go to
www.puppymillrescue.com? You will see what a puppy mill is and you will NEVER want to support that industry if you love dogs!!!!
Good luck with your yorkie baby wherever you get one! Just please don't buy one at a pet store!