A lot of my longer stories have terrible last lines. That being said, I think I have a good one planned for Running Up That Hill. I have noticed that in my one-shots I tend to book-end my first and last line, either making them exactly the same as or some variation of the first line.
My favourite of these is from Total Request Live, where the story begins with Nick saying, "I hate TRL." and ends with him saying "I love TRL."
Touching on the feedback thing, if I'd written solely for feedback I'd have quit writing ages ago LOL. My old website had like, one comment in the guestbook. But I kept posting stuff and writing because it was fun and because I enjoyed it. Of course getting reviews is nice, and I'm sure some of my work could have a lot more reviews if I begged for them, but I'm not going to do that. To me the feedback isn't worth much if you had to pull teeth to get it. It's much more valuable to me to know that someone clicked into my story, read it and liked it because they actually wanted to, not because I asked them.
Besides, if I wrote for the purpose of getting reviews, you'd see Running Up That Hill updates a lot quicker