Have you ever heard of college admission officers looking through the site?
I hope so! I'm proud of how much good work you have all done here. And I often tell people they should become contributors so that they can list that on their applications and resumes, etc.
I don't know the answer to your question about how many people have gotten in to colleges after getting help here, but people often come back and say "thanks I got accepted," etc.
Most importantly, we need to remember that the only alternative to this kind of collaboration is to NOT collaborate, and failure to collaborate is dangerous in this fast-paced information age.
A writer's group is a writer's group is a writer's group. :-)