i just kno from experience that you get more money out of the pups if their parents are registered. (not saying that money means everything. cause i would much rather see the dog go to a good, loving family, than get an extra $100 bucks from someone else.) But i believe this because alot of times when the dogs are breed intentionally the breeder will take more time, care, etc.(Like picking a good dog to stud, therefore producing a better litter, allround.) Verses if ur dog jus so happens to get knocked up and you're just trying to get rid of the pups. People also like the fact that they can "brag" that they're dog "has papers." and its a BIG plus that when u register w/ the APBR u get acess to things like this awesome page. Also, its great being able to show & keep track of their pedigrees.