Dear Jing,
I am no expert, I have only lived with CzW since february 2007. But my opinion is that, if someone want working dog, buy a german shepherd or other breed that for sure will do what work you want.
But you are right with that, there are kennels that do work with their Czw and compete too I suppose. But behind every CzW there is wolf, and even if you would buy a puppy from one working kennel, you still have a little bit of wild wolf in your leash. There is no quarantee of what you get, It is up to owner, if they understand their dog, understand how to train, what just "this unique wolfdog" needs. There is no way you can make a wolfdog to working dog with exams as "easily" as a GSD or Maliois.
I have much to learn, and I admire people who are good at training their dogs!
But this is my opinion. I have only trained obedience with my female Blazy for 3 years, not for exams, only because I enjoy it and I think dogs needs to do something with their head too, not just run and eat all the time
But Blazy is no working dog in my eyes, she is my sofa wolf...
Best regards
Jenny