Here from metafandom. I marked "I have no expectation" because it really depends on too many factors. If I'm agreeing on meta, I figure, okay... I'm just chiming in and the poster can assume it's like a meeting and I'm sitting in the audience nodding or something. If I ask a question or would like something clarified, I hope for a response.

For comments on fic, if the writer gets a lot of comments or the story has been up for a long time, I assume they're overwhelmed or have a lot of irons in the fire and can't reply to everyone personally. They wrote a fic, I said it was good and the circle of life is complete.

Of course, it's always NICE to get a reply and 9t feels good to be acknowledged, but I'm not wounded if it doesn't happen.