The fundamental problem is that people like reading things that are written by people that have a slightly higher IQ than them (at least for people this side of 100).
What is your evidence for this factual assertion? (I have done a huge amount of research on IQ testing, and I have never seen a trace of a finding like this in any of the research literature.)
But I've grown and the community probably became a bit more mainstream and less intelligent.
How would we assess the "intelligence" of an online community?
Why not rather just help everyone acculturate?