AM was living with his parents and had never held a real job, if BB is to be believed. He couldn't afford to move.If he was so worried about not getting to see the girls anymore he could have moved closer to their new home. That is much simpler than kidnapping 4 people. It had to be something more. He may have conned his mom and ex but I think he had a more sinister reason. The idea he could keep 4 hostages is ridiculous. He went for kidnapping and murder instead of just moving.