I know this might not be a popular sentiment among breeders, but I don't think a dog like that should be sold for as much as a puppy. The breeder is usually rehoming the dog because it is no longer useful to them. The dog has had her litters and done her time in the ring and now the breeder wants to bring up a new prospect. I am not saying the breeder is a bad person for rehoming the dog. In fact, I think it is very kind and a selfless act on the part of the breeder for a dog in a breeder home to be rehomed into a household where there are fewer dogs and more attention with the opportunity to live in the house with their people 24/7 (in some cases, breeder dogs live in kennels at least part time) and maybe have a new job if the dog leaves the show business and is bored.
As a new owner of one of these dogs, why would they care that the dog was pointed or an AKC GCH? Or that the dog's litters of puppies were awesome? They will not benefit at all from any of that if the dog is spayed, other than the health clearances. If the dog was trained for a sport (obedience, field work, agility, rally, etc.) then I can see the value going up because it's above and beyond the normal training that any four year old dog would typically have, which is a benefit to the new owner.
If the breeder can get the money and ensure that the dog has an amazing retirement home, then more power to them! And, for some, the value of a house trained, socialized dog that probably won't change in temperament is worth a lot - you know what you are getting temperament wise and don't have to deal with the teeth and the house breaking or the crate training, etc. For someone like me, the value of a dog that can be shaped and molded into what I want is worth more money PLUS dealing with a puppy (which I really love, teeth and all!).