<p>^See post #5 here:</p>
<p><a href=“http://talk.collegeconfidential.com/college-admissions/1312925-why-there-such-massive-use-waitlist-year.html[/url]”>http://talk.collegeconfidential.com/college-admissions/1312925-why-there-such-massive-use-waitlist-year.html</a></p>
<p>I could be wrong in how the numbers are calculated, but I think that it also helps to reduce acceptance rate, which is a factor used in rankings. A school can keep down initial acceptance numbers and rely more heavily on those that choose to stay on the WL and therefore will be more likely to attend if accepted.</p>