Just a few months ago, I bought an app from the Mac App Store. I became disenamored with the app due to a glaring fault. I regained consciousness about halfway through writing my negative review on the App Store (that'll be my excuse for getting as far as I did), with the thought, "Why don't I first email this guy and see if he'll fix it before writing this review?" So, I closed the review form and opened an email. Sure enough, he responded within the hour, and a new release came out the next week with my suggestion built in.
My next email to him was explaining why he should raise the price of his app. He was a real person.