It's not guaranteed that those "shit posters" would be active in the discussion, they just want their posts counted, That's it. For you, for me, or for some people that aware, your idea is good enough. Even I'll say for sure Super agree with your idea.

The main problem is people itself (this is about self-awareness). So, let's start with our self, give 'em a good instance. We have a moderator and also report system, let 'em work. They will throw away posts that potentially invite tons of "shit poster". It's a process, so yes, we can't do it in a minute.