Try it. They can't reject you anymore than they already have. Besides, you'll feel better if you've tried.
My friend at the law school that I have been rejected from (which was my first choice) told me that he knows a woman on the admissions committee and she said that they accept appeals and sometimes they work -- does anybody have any information about situations like this? He said his friend got into UCLA that way... I'm only thinking about doing this because it was my first choice by FAR and I'm really not that interested in going to anywhere else that I've applied to