I'd rather give my money to people who are passionate about producing their own animals. People who take great time and effort selecting and caring for the right animals for their breeding projects. Not to mention selling an animal that I can rest assure is healthy.
My last point is the one that bothers me the most. How could you possibly practice proper QT when you have animals coming in and out so frequently. I've yet to see one of the flippers talk about their QT procedures.