IIRC, something like a third of all registered members of the board have no posts at all, and over half have a maximum of one post. Thus, the median number of posts per user is 1, and the mode is 0 (though the mean is about 136).
Of course, a question like “what proportion of randomly-selected posters get banned” depends on how you define “randomly-selected”. You could select posters uniformly from the set of all SDMB members, in which case the folks who make only zero or one posts are extremely relevant, but nobody really cares much about them. The better question is probably predicated on choosing posters from a distribution weighted by the number of posts that poster has. Which would work out to be equivalent to the question asked earlier in the thread, of what proportion of posts were authored by a now-banned poster.
Oh, and incidentally, we hit 12 million posts some time between when I opened this thread and now.
I do think that the important thing is how many great people never get banned, post daily, and fill our days with joy - or at least some modicum of entertainment.
kabbes was a third poster that did a lot of research on posters and patterns. Quite impressive stuff. I did keep some very primitive lists of high-post-count users, but their analyses were on another level. If I recall correctly they were asked to stop what they were doing because of concerns about board performance, but I can’t find that post.