This is a common misconception. AKC papers are worth exactly what they are printed on. The AKC is a registry only, not a regulatory agency. They require no proof of health or quality to issue papers. C-sections, antibiotics, milk replacement for puppies, etc, all cost a lot of money.
Most pet owners buy their dogs for pleasure.
You need to let them have a litter before they are spayed. These are nothing more than old wives tales. The benefits of spaying a bitch before her first season out weigh those of leaving her intact. A bitch left intact suffers a greater chance of contracting diseases and living a shorter life. A spayed bitch has no chance of developing pyometria, endometrosis, uterine and ovarian cancer and has a much lesser chance of developing mammary cancer, one of the more common canine cancers.