I have to admit we got our first yorkie at a flea market. My wife got him as a surprise birthday present for me. Since then, we have learned so much and would never consider such a thing again but I believe many people get their's this way or they wouldn't still be selling them there. The buyer receives little or no instruction on proper care and has no idea of the quality or health of the puppies. It's really sad that some breeders do this.They depend on 'impulse buying' which is the wrong way to get a puppy and the breeder knows better. As far as some of the other 'breeds' you mentioned, all I can say is....OMG
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