If i had a child abducted, i would take any means - and i mean any - of keeping her face in the public consiousness. If that child is alive, she will be getting fed by someone, who has to shop for food, pay rent on the house they live in etc. Eventually, the captors may slip up and someone will catch sight of her face. If she is being used in films, someone who views it may get a guilty conscience and report it to the authorities. The more publicity the better. Ask any parent what they would do and it would be the same as the McCanns.