Most people that are willing to pay that have a strong breed preference, and can afford the upkeep on an animal without having to hesitate in an emergency.
A strong breed preference usually means someone is familiar enough with the breed to not go into it blind. This means less chances of them ending up in rescues compared to your neighbor's litter from two mutts.
Yes, that's not everyone. Some people are idiots and think throwing money at a dog means that they don't have to put in any effort into that equation.
There are also shitty breeders and/or puppy mills.
But never shit on someone that payed for their dog and still have it. They did things right, and that's a shit ton better than the ones that don't care enough to do it even badly.