I've submitted 3 or 4 stories and the reply against those reading them worked out at 0.007%! However, I enjoyed writing these stories, and although I get a bit disappointed at the lack of replies, I don't let it bother me. I write for enjoyment and getting my twisted thoughts written down. If others enjoy them, then I regard that as a bonus.
I will admit I am very guilty at not responding to others. Most of that is because all I can think of is along the lines of, "That's very good. I enjoyed that", and I don't think that does justice to the effort someone has put in to write their story in the first place.