If quite literally every person I interact with professionally has an anecdote about this happening, your anecdote about it not happening is not very convincing.
Have you/SO staff/SO mods considered why this impression is so prevalent if you’re confident it’s (as you claim) not actually true?
I was the only one with formal education and a professional background consistently answering, and frankly, that site needed my expertise a hell of a lot more than I needed to share it— and they failed to provide a reasonable forum to do that despite being its sole purpose. If the point system actually represented expertise, it might have worked. I’m fine with being scrutinized by a peer or superior… But it didn’t go down like that.