You have to think like this, breeds were created to excel in their fields by breeding the best dogs to the best bitches at their craft.
It's the whole principle of selection, not saying that you can't find a diamond when breeding to sub standard performers but it's all about stacking the deck in your favour.
Regarding Pye though, I'm not knocking the dog when I said it's ten a penny. My point is I doubt it was doing anything exceptional, many bull crosses were single handed dogs.
It's just not everybody feels the need to put their handy dogs up for public stud and to make a name