I don't comment to get replied to or expect a thank you, when I write something lenghty and thought out I just send it and forget about it. But I get what OP is saying because every once in a while I like to go through my post history (I think I'm fuckin hilarious lmao, I can read something I've posted a couple weeks ago and still think I'm funny hahahaha) but when I see a post that I took a long time to write that is buried in a thread with just my own upvote, or in threads where the OP hasn't replied to anyone, or to many people but not me, stuff like that, I get kinda bummed out.    On the other hand I love seeing the inbox button lit up and it turning out to be a thoughtful comment that makes me think a reply through so it balances out, but if reddit was just people who don't reply I'd bother a lot less and end up deleting before sending much more often than I do now (and I do it quite often)