Any breeder who sells 6 week old puppies is not ethical.
AKC/CKC registration means nothing and your puppy is no doubt NOT breeding quality. If you don't show your dog to a championship, don't breed.
If you are on a non-breeding contract, and breed the dog anyway without showing him, then you are not only a backyard breeder, but are breaking the contract and can be sued.
If you want to ask more questions or discuss this further, please start a new thread.