I generally try to reply to comments people leave in my journal because I'm happy they chose to comment and I want to encourage that behavior. That said, I'm not offended not to be replied to. (Minor exception: if a person has replied to all the other comments on the page and not mine, it does make me wonder why not. That's not the case with your entries, though.) Though I do agree with lookfar's comment about whether it feels like a conversation.