I'd write them a letter back letting saying something along the lines of...
I wanted to thank the ADCOM for considering my application. If there is any correlation between the number of rejections a school sends to an applicant then your 3 rejections must mean that you're the all time worst applicant that they've ever encountered.
Since you are in that record breaking position I don't feel it would be out of line to ask how you could improve your application next year so that you could maybe only get 1-2 rejections from them. <img border="0" alt="[Laughy]" title="" src="graemlins/laughy.gif" />
What are they going to do...reject you!