
or of course the pup just might not be the type favoured by the judge (assuming they were knowledgeable about the breed as non specialists are most likely at Open shows, and some may have colour bias) or those particular exhibitors.
It would be a good idea to get an opinion of a breed specialist judge (or several) who have no axe to grind (are not competing with you at the show ;)
It is unlikely that you will have a top drawer show dog from several generations of breeding where the breeder is not knowledgeable or trying to breed to the standard, bur it can happen.
As said before showing your pup can help you learn a lot before you go on to try your hand with something of better quality. Often breeders are loath to part with their best pups to total novices as they rarely get the best out of them, and unless the breed ahs a long show life the dog is often wasted, but if someone has already gained show ring experience breeders are more likely to trust them with a promising puppy.
Tommee is right that there are other forms of dog activates, but personally most of those require a greater level of commitment of time and training, than showing which to the average exhibitor can be more relaxing, as you can do as little or as much as you like, once you have the basics of ringcraft.