For those of you with the "kind of thick but not really thick" envelopes

<p>If someone is on multiple ivy waitlists, is it ethical to remain on all of those waitlists? And, if it is true that the applicant would absolutely attend ANY of the waitlist schools over the places where he has been already admitted, is is permissible/ethical to write that in the letter to every school? Or should he pick one school and tell them, you are my first choice?</p>