Well, I'll tell you this...it doesn't matter how well a person knows lines and how much they show or how many wins they have had, they can still have produce poor quality animals on thir farm.
As an example here, and even though I won't use use names, there is one famous horse/line in particular that is "hot, hot, hot", with both direct sons/daughters of that horse and generations of decendants, that have many Nationals wins etc. BUT, I have also seen some from that line, and even DIRECT sons and daughters that I feel are only pet quality, but yet sell for anywhere from $15,000 and on UP....WAAAAAAY up, just because of their sire. I have seen some of these that I would not even want to use in my herd even if they were GIVEN to me, yet they get thousands and thousands of $$$$ for them! Don't get me wrong, I am not bashing this line, and in fact I LOVE MANY, MANY horses from this line, but am just using it as an example of how some pet quality horses are sold for tens of thousands of dollars just basically on bloodlines alone, and not on the merit of their conformation.