Firstly, the AKC promotes all dog ownership and has a program called Canine Partners where mixed breed dogs can be registered and enjoy the same benefits as a purebred registered dog. The AKC also donates hundreds of thousands of dollars to the Canine Health Foundation (researching canine diseases and cures which would, of course, be available to any dog through their vet) as well as operating the Humane Fund which donates to rescue groups, trains domestic violence shelter workers so victims of domestic violence don't have to leave their dog behind when leaving a bad situation, and funds events that promote responsible dog ownership including spay/neuter clinics.
Secondly, you can use this link to request replacement registration certificates in the event of loss (
http://www.akc.org/contact/answer_center/faq_dogreg.cfm). The only reason new papers would not be issued to you is if you are not the registered owner of the dog.
Thirdly, a purebred dog doesn't need to be registered with the AKC to be a purebred dog. Regardless of whether or not you have the registration papers, if you have a purebred dog and know the lineage your dog hasn't changed breeds.
Fourth, there are hundreds of thousands of purebred dogs that don't meet breed standards. Conformation showing exists to evaluate breeding stock. The dogs that best fit their breed standard win and can gain titles. Dogs with higher titles are in higher demand for breeding. Not every puppy that comes out of ideal breeding stock will be an ideal representation of the breed. Think of it this way-both your parents have dark brown hair, blue eyes, are tall and thin. You may have blond hair, brown eyes, short and heavy-set. Does this mean your parents aren't actually your parents? Of course not. Just like dogs that don't meet breed standards are still the true offspring of their parents, and thus, purebred. In that situation, a responsible breeder would only sell the dog as "pet-quality" meaning a spay/neuter contract would be in place and the dog would not be eligible for conformation showing. In this way the dogs that don't meet breed standard aren't reproducing and potentially adding to the numbers of dogs that don't meet breed standard.
Finally, there is no guarantee that any dog will meet breed standard as far a temperament and purpose. They're not machines, they're dogs and they all have individual personalities and preferences. If you say you've seen "mutts who could put a champion to shame" I assume you're referring to performance events such as obedience and agility, because a mutt would not be able to enter an AKC conformation show. You seem to have the wrong idea about conformation showing-it's not a competition to see which dog is the most mellow, best family dog, best guardian, most athletic, etc. It is solely to evaluate breeding stock. Many conformation champions also excel in other sports, but there are also many that don't. There are many mixed breed dogs that excel in performance sports, but just as many that don't.
When buying a purebred dog, it should be because you value the traits of the breed, and it should be from a responsible breeder. If you don't have any specific traits or appearance in mind, adopt a rescue dog-but don't hate on the people that know what they want and know what they're getting when they purchase a purebred dog. Also, you should do your research before spouting off "facts". For the record, I have rescued pure and mixed breed dogs, I have bought mixed breeds from breeders, and I have bought purebreds from breeders-they all have unique personalities and qualities and deserve to be treated as individuals.
參考: AKC judge, exhibitor, and dog training professional for over 20 years.