The future may not be read with impunity. The threads of destiny for a person are wrapped through the days of their lives, known only to the omniscient beings known to their followers as the Fates.
The secrets of the Fates are hidden from the eyes of mere mortals and only those with the gift of Mythos may begin to lift that veil. For the Odani people, as servants to the Fates, the gift of foresight is passed down through the female line.
From Mother to Daughter, the ability to see that what will be has allowed the Travellers to remain healthy, wealthy and wise. Of course, it has the added benefit of staying one step ahead of any authorities that wish to limit their nomadic lifestyle.