Anyone who knows me, or has talk to me about breeing horses, knows that I am against breeding unregistered horses (for several reasons; it's a great way to trace and research genetic issues such as herda and HyPP amoung other reasons which I won't get into right now) I also don't believe in breeding just because you want to try your hand at raising and training a foal. I think you should educate yourself before even considering breeding your mares. I think there is some basic conformation qualities and NEED to be met before a horse should be bred, along with a certian disposition and ability.
Now, with that being said, I also think that some people get way to carried away about what they consider good breeding stock. I don't think that EVERY horse needs to have a champion/proven sire and dam. I don't think that stallions with a $5000+ stud fee are the only ones that should still have their junk. I don't think that every horse that is breed needs to have perfect confromation. Good conformation is in the eye of the beholder and and almost every horse who has gone out and been used in it's discipline of choice and has done well has at least a few conformation faults.
IF this was the case and only proven mares and stallions were breed how many of YOU would be able to afford to purchase a horse? How many of you would have the horse that you have today?