Because you want a healthy “thin” snake. By your description it sounds like a garter snake would be better for you, it would stay thinner than a bp and it can eat fish, which would or should equal you being a happy pet owner. Also, the bp in the first pic is very, very thin and suffering and for someone to purposely keep a snake underfed just to please themselves is outright wrong should not own a pet.
no no no no no, i respectfully disagree, it MAY seem to you that I would keep my BP from eating so it would be 'thin'. Nope, it was just a question, I really like Pythons. I can assure you I am a responsible pet owner, my dogs/cats can tell you