I wouldn't do it simply because I've come to realize that I have a very unique writing style. People have told me that before, and after suggestion #30 that I should write a book, I started paying more attention to these comments, but it didn't really hit home until one day I posted something nondescriptive on Craigslist and within an hour got an e-mail from a close friend saying "Hey, is that you?" with the message quoted.
So I wanted to make sure that my writing remains MINE - I don't want my PS to be easy to confuse with someone else's, no matter how well-written it might be after a review by EssayEdge or whomever.