Musashi is a greedy creature, if one is looking to employ her they need only something of worth to give the demon. It could be gold, or jewlery, but it should having meaning for the employer. Maybe not as high of value as a most prized possession, but something close. Be sure to get Musashi to do her part before giving what she wants so there could be a trade, otherwise Musashi will keep it all regardless if it's an item or information.