not a lot of people even bother opening posts
I'm a bit inclined to agree with this. I try to do the equivalent of the XKCD hover text, where you have to click through to get some of the good stuff. If you aren't clicking through to the comments, you're going to miss a lot of good stuff. Photo sets, photography tips, stories, fun facts. I try not to have the pic and title be the whole thing. But I'll have 100 upvotes on the post pic, and maybe 10 on any bonus pics inside.
With some news posts, they feel like a RSS feed. Just a link to an article and nothing else. I may read it or I may not. There's no initial comment or question to interact with. I don't even know if it's a bot posting or not that way. If all you offer is a Reuters link, I could have just gone to Reuters and gotten the headline myself. I feel these posts have little value until they start collecting comments.
“Yes I agree, nothing to add”
This is a common response I get when I try to get people to comment more. There can still be value to add to something like this though. Why do you agree? Did you agree before you read the post/comment? Do you have any caveats to your agreement? If you haven't always agreed, what changed your mind? What part of what they said, or the chart/pic/stat they shared really stood out or was unexpected? You may agree, but you're still a different person with a different background and different adjacent ideas.
Example from today: Pic of flying owl. Comment was basically I like all these recent pics of flying owls. On the surface, not the deepest comment ever. Buuuuuut, someone took the time to respond to a post, so I know they liked it enough to make effort. Makes me feel good knowing I motivated someone enough to respond, keeps me motivated to post again. I also learned that a specific type of content really got them interested. I know to look for more of it. Then I took the time to respond in kind, because their effort deserves recognition. I said I'm glad you're enjoying it. I also said that even though I see hundreds of owl pics every week, that I was still surprised by something I saw in one of the recent photos, so that gives them or anyone else reading the response something to go back and look at. They might not have noticed the unique thing about the photo the first time.
Example going the other way: Maori rights in New Zealand. You can't get much further from NZ than where I am. I know basically nothing about it. This topic really caught my attention though. I read the article to see what was going on, and I thought I understood the basics of it. I commented and said, hey, I read this, and this is my understanding. Am I correct in my understanding or am I missing some significant parts of the story not in this article? If so, can someone explain it or point me in the direction of some more reading? So I know nothing, but I showed them the story was making me interested in something they shared. Anyone familiar with NZ can chime in to talk to me. I hopefully get more things to talk about from that, and we have some conversation. I don't have to know anything, I just show interest in the topic, and in interacting with someone.
Not every interaction is going to result in more upvotes, comments, or conversation, but if nobody is going to be willing to make the first move, it's gonna be boring. We're not big enough for the 1% rule (1% creators, 9% commenters, 90% lurkers) to carry us. It kills the creators having to force the momentum all the time, and if you disagree/agree too much with the small pool of comments, you're going to say this place is boring. We need to participate, we need to show our individual personalities, and we need to interact. That's the "social" part of social media. Have fun with it!