Good point! For me, I just decide per comment how much to upvote it. A reply that shows someone actually read the post gets a good percentage upvote, but something like "Good post", "I agree", "Nice picture", I will probably ignore, depending on my mood that day. 😅
It's also why I don't comment when I don't have much more to say than "I love that pic!" and if I really, really want to say that, I try to delve a little deeper so the author actually feels like I care.
Socializing is hard!