I think the key thing is whether the people making the feature requests are paying you. We get feature requests all the time, but they are the people paying us thousands of dollars, so those take priority. If they aren't, or it doesn't appear that anyone else paying us will use it, then they shouldn't take priority. This is a way of whittling down what is really valuable to people, rather than just they took long enough to write an email about a cool thing they really think you should do.