I agree to this part. Yeah, its true. It doesn't mean that a particular post is a "shitpost" just because it has no Merit. Some post are just being ignored by other Members that's why they can't notice that a certain posts is meritous.

There are 3 reasons (in my opinion) why a particular post can't receive a Merit.
1. Post being ignored.
Like what I said, some post are just being ignored that why it has no Merit. Although a particularly post is a Good Quality Post or Informative, if readers ignore it, then it won't really receive a Merit.
2. Because it is posted in Megathreads.
If you're one of those Member who always liked to post in Megathreads, your posts won't really receive Merit. It is hard to read post in such threads mostly if the thread is flooded with spam posts. Most of members who give Merits for Good Quality Posts doesn't visit Megathreads too much, that's why there is a possibility that no one Merit your post there. But sometimes, some Members do.
3. Spam post.
This is the common reason why no one Merits a particular post.


Besides that, about the other thing you were trying to say.  I can't barely understand what you want us to understand. Or I'm just a little lazy to understand it.