On the question of possible improvements ... have you ever considered a poll that asks a very specific or technical question about the mechanics of your story? I don't mean one of those "comprehension" questions we used to get on standardized tests in public school ("The bunny Peter saw outside the window was a) brown b) white ...") I mean something you as a writer struggled to convey - a subtle plot or character point that you tried to make in a particular way and don't know if it worked or not. That would be "evaluative" in terms of how well your writerly craft is working, rather than as a broad judgment (the story was good/bad). I wonder if readers would be more willing to answer a specific question than "did you like it?". If they are, you would get your "read it" stat along with feedback that's actually useful to a writer.

I put up a poll at the end of an old story of mine, essentially asking at what point the reader knew two characters were going to get together, and including a few options. People responded to the poll who didn't comment and I got some really interesting information. In a way, I don't really care whether people like my stories (because I write what I like and that's not going to change) but I do care about whether I'm communicating what I mean to communicate.