This should be pinned, and somehow linked to from every story Kev.
Readers need to know that being greedy is unacceptable.
Our authors take a lot of time writing their stories, getting them beta-read, edited, sometime zeta-read. It's not like these stories just suddenly appear out of nowhere. Lots of time, effort and emotion goes into every single story.
If someone gives you something for free it's considered common courtesy to thank that person. Why should it be any different here?
Readers, please consider the feelings of the authors whose stories you're reading.
Look at it this way. How would you like it if lack of feedback made your favorite authors give up writing because nobody bothers to comment on their stories?