Why is "Step Up to Medicine" reviewed by mostly medical students at "lower-tier" schools?

Completely unimportant, just-because-I-was-wondering type of question. I was simply surprised, I was expecting contributors from Harvard, Yale, Vanderbilt, etc, but nope. It's a lot of people from places like Lake Erie, Edward Via. Not saying that's bad I'm sure they're brilliant people. Like I said I was just surprised, there may not even be a real answer.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums