Don't forget it also goes the other way. Just bc some byb charges $5000 for a yorkie pup doesn't mean it's healthy, from quality sires or within standard, they are just taking the rich suckers for a ride.
Also look out for rare or off colored (off standard, a fault), and other tag words like teddy bear face, micro, baby doll, etc. Really, in this day and age, why are these people still around?