you have your own opinion, thats fair enough. But I've stated the obvious. Its like me going to buy a Labrador from a pet home, and then training it to work with the gun. Yes, it'll work to a certain extent with the right training and entering, but would it be as good or better than one that is bred for work?? The answer to that is NO! Same goes with terriers, I wouldnt buy a border from show stock, and expect it to be a top class digging dog would I. Point proven.
people buy show whippets and have success in the field