Quoting Jude ♥ JGL:" I don't understand why someone would care about papers unless they planned to show the dog."
I can understand. If you want specific qualities, a pure bred puppy is the best chance at getting those. I got a pure bred doberman before, and will likely get a pure bred German Shepard in the future. I was specific traits, and the best chance at gettings those things in a puppy is to get a puppy that is pure bred, especially if you can trace it's lineage and it has good breeders.
Also, if there is a puppy already born, then it needs a home also, doesn't it?
I don't agree with backyard breeders or irresponsible owners who add to a huge population of mutts, but I don't think badly of people who want a specific breed of dog either.