If my dog were a pet only, no, I wouldn't get it's hips and elbows certified and I would look for another breeder. For one, anesthesia carries a lot of risk, and it's also costly. I can see you requiring it for performance dogs, and I would always test my dogs before we got involved in performance. Like with Nova, I still can't tell that she has hip and elbow dysplasia, but when she was x-rayed the vet said it was severe enough that we needed to stop agility and couldn't compete in it, but jumps in obedience and rally are fine for her, since there are only a few.

Now, I could see if, when they're altered, you ask that they are done and you offer some sort of rebate (nothing huge, but enough to make it more tempting for the owner to do). But most people are probably going to have this done younger than two years so it wouldn't be a final grade, but at least you'd have some sort of clue as to what everyone's looking like.

I would CERF no problem. CERF is painless, cheap, and only takes a few minutes.