But, if you take a step back there's a very strong metaphor for self IQ reporting in masturbation. You've already mentioned the self gratification and the exhibitionism aspect. IQ is essentially a (alleged) representation of potential, not only is there exhibition and self gratification involved, there is also a certain decided lack of propagation of that potential in reporting your number in a supreme act of solipsism, much like blowing your load onto a busy sidewalk corner. No doubt there could potentially be information to be gleaned from such activities being done in groups, but I imagine that circle jerks aren't terribly analytical activities.
From a psychosexual point of view, I'd connect displays of comic book collections as more of an exotic display of mate attraction, and the discussion of typology as a a number of things depending on the approach and reason for involvement.