Here's my APHA mare's pedigree. She has some decent horses in there but most are further back. Worlds Chilly Filly Paint
I have 2 Grade geldings that are half brothers. One is a purebred Curly but was never registered, and the other is a Curly/Spanish Mustang cross.
The Curly side goes back to Ernie Hammerick who was basically one of the "founding fathers" of the ABCR (Curly Registry) and continued to breed the foundation Curlies as opposed to crossing out with Arabians, Thoroughbreds, Ponies etc like many Curly breeders decided to do. Bad Warrior who is one of the best known Curlies would have been on my purebred's papers as his dam was sired by him. He also would have him on his sire's side but I don't know how far back that would be. Neither of his parents were registered but came off of a large section of land in South Dakota. By then, Ernie was old and couldn't keep up with all his Curlies which is why the sire and dam of my boy were never registered.
I love bloodlines but I'm not stuck on them for making my decisions when purchasing a horse. I'd take an amazing Grade over a decent registered horse any day.
I really do my research when breeding though. (Not that I breed much but that part is very important to me if I'm going to breed)