It lets me feel like my time here is being useful if I get the upvotes. I try to limit myself to positive/fun/helpful posts or adding additional facts from other articles to someone’s post of I feel more info is needed to get a full story, so if people reply or at least upvote, it feels like it was worth adding my contribution. If my humor/help isn’t needed or wanted in a place, I don’t want to both waste my time and annoy people.