I checked "I would prefer not to get a response" under the fic question, and I'd like to explain that. I love hearing from authors; I love it when people ramble at me about their stories in response to my feedback. If I left feedback, it generally means I liked the story enough to be interested in those insights. But a lot of the time, even when I leave long comments, all the author has (time) to say is "thanks!", and I don't need that acknowledgment. I'm very picky wrt what I read and I comment because I feel somewhat strongly about the fic and have something to say; the author choosing to engage or not engage in a conversation with me is irrelevant to whether I'll read and/or comment on any more of their stories.

In addition to that, I'm one of those people who goes "ooh, new messages!" when they open their inboxes, and when one of those messages is just a "thank you" from an author I didn't even remember I've commented to, I feel a tiny bit disappointed. And that's what shifts the balance towards 'I would prefer not to receive a response'. The real answer would be 'I would prefer to receive a response with some semblance of substance, or no response at all'.

Other than that, I agree with the above commenters about expecting a response only when you're trying to engage the OP in a conversation. If someone posts a picture of a random cat and I go, "Ooh, cute!", I really don't expect that person to say something back.