When you allow a fresh set of eyes on your admission essay it is almost as if your personal statement is getting practice. After all, your statement will ultimately end up being read by one or more people while your application is being reviewed so it makes sense that a well read personal statement should do better in its final stages. Why have the reviewers catch the mistakes that someone else can catch beforehand? It is far better to catch a small mistake that can cost you admission, before it actually has the chance to cost you.
When you set to create your personal statement for college, you suddenly are not in that world anymore, and you know it deep inside. Seriously, no one from admissions wants to read another essay about how much someone was inspired by Gandhi, or Martin Luther King Jr. No one wants to read your personal statement for college about the first time you played football with your dad, or learning the value of teamwork from a little league game. No matter what you write, the chance is that they have heard it all so often before, and they are surely going to hold that fact against you.