"not all opinions or arguments are equally valuable" - Maybe not necessarily to you or I, but perhaps to someone out there? Who makes that decision of worthiness?
"your argument of all posts being equal just flies in the face of reality"; "let's be honest and not pretend that all posts are equally valuable or relevant, because they simply aren't"- Why? These posts are based upon opinions, experiences, knowledge (perceived or actual), or experimentation of an individualistic nature. I've been involved in shooting and airguns for over 30 years - "been there, done that" many times over, but I make no claims to knowing all there is to know. Dismissing even a newbie post can be an opportunity lost. It's all a matter of perspective.