Some people may also be posting their info before the end of their apllication process. So, for example, I tried it out and put in the schools I was applying to, clicked that I had gotten secondaries from some, an interview at another. Unless you click "accepted" it says in your profile that you were rejected, even if you are still waiting to hear back.
So, my theory is, some of the profiles have been left incomplete, thus showing that that genius with a 40 MCAT and 4.0 GPA was rejected to all 20 schools that they applied to. I think people may havce the tendancy to post their incomplete profile out of excitement for the application process, then never update it after they are accepted.
Kind of annoying, this site could be helpful, but the way it is you can't trust the statistics.