Why the hell would you buy a dog from a puppymill pet store in the first place, when there are thousands of shelter dogs, not to mention people giving away litt

Why the hell would you buy a dog from a puppymill pet store in the first place, when there are thousands of shelter dogs, not to mention people giving away litters on Craigslist and the like? Unless it's a show dog, or breed stock, paying that much to buy, let alone lease, a dog is ludicrous.