The device that controls sleep apnea is highly recommended because apnea causes irreparable damage to heart, brain and leads to premature death. He may save $1000 and lose a chance to live a happy life, but this is his choice and his responsibility. Sometimes it is hard to respect someone's choice, but what else can we do? In my opinion, it is impossible to motivate an adult to take care of own health. The only motivation that works perfectly with anyone is fear. A true fear for life make people change their lifestyles dramatically. As soon as fear fades away, the old habits get back. Are you sure this is your calling to address it for your bf?