I actually have a reliable indicator as to a comment's value as well. If the person says they have a reliable indicator of a comment's value and use that to dismiss anything the person says (yet still finds the need to post a comment in response), in my experience that's a reliable indicator that the person is no longer saying anything useful and just wants to increase their post count, usually so the account has value when they sell it to a marketing company.

So what's the point in commenting if you don't think my post has any value? All I can come up with is that it makes you feel superior.