Comments don't seem to be upvoted as much as posts as a general rule. Also, I think they need to fix the comment system. The whole maximum depth and having to reply to a post that isn't really the one you are replying to is weird and sometimes makes things hard to follow. And ordering comments by trending or votes doesn't make sense except for maybe top level comments. I don't know, I just find the comment system a little awkward and I think that is one of the things that prevents more engagement.