There was some data collected for, I believe, the 1996 application cycle. It showed that Columbia had a waitlist of 600 people. It ended up taking 30 people from that waitlist. Even though that data is from a long time ago, it's definitely not comforting. I'm having trouble writing a LOCI since the probability of an acceptance seems so small. Regardless, I'll stay on the Columbia waitlist as long as possible. I'm not too sad about it, I have a 30k a year offer from GWU. I'm sure the rest of you have similar offers that rock just as much, if not more.