Making the a art out of writing to other humans.... hmmmm ;)
Okay, but it was still just a simple suggestion, I think you put to much into write to each other.
Every person on the board dont know the intention of others members posts (like Bots is really hard to read and understand proper, because he writes what just pop into his mind, and not careful trying to translate a thought/idea to text), therefore there is no such thing as the 2 possible interactions / deciphering of a post as you state. If people disagree they are much more likely to post it, than if they are indifferent or agree with it. Maybe you a like that Num, all respect to you, but all people are different.
A lot of topics die out, and if more interesting topic popup, people (or maybe now I generalize) tend to move and respond to the newer topics...