Breeders don't breed for shows and titles. Breeders go to shows and put titles on their dogs in order to prove that the dog has solid temperament and is solid in obedience. That proof gives you a better idea that the puppies the dam and sire produce will have a solid temperament and be capable of whatever it is that the parents were titled in.
A dog that shows its obedient on its home turf, might not necessarily have the temperament to do it outside that home turf. So testing a dog, outside the place where its most comfortable, is the best way we have right now of proving a dog has a solid temperament.
Not sure what you consider expensive, but you should expect to pay $1000-$1500 for a well bred working dog. Show dogs (conformation) sometimes go for more than that.