At Exeter, at least, you don't have to be at risk. We have a relative there now who is on scholarship. Her parents are both university faculty, just not well-paid faculty😐. I think it helped that they do not live in the northeast, so some geographic diversity they were trying to achieve; she is also an athlete. There are still significant costs involved, though (flying home and back for each school break is not exactly cheap, not sure how long they can sustain that, for example).