If you go to quick links, members list, and then arrange by "posts", you will see that there are 5753 pages of members, 30 members per page. It claims that there are in fact only 172,575 members - perhaps the missing numbers have been banned, but are still counted in the overall figure. This seems like a huge number and percentage to have been banned, but of course I don't know what the explanation is.
Anyway, out of the 5753 pages of members (30 per page), 4818 pages are fully composed of "members" who have not a single post to their names. Not a single one. That is 144,540 out of a total listed of 172,575 (83%!!!) who have never posted, or if they have, have had their posts removed. Assuming that the page is inaccurate, and that there are actually a total of 213,000 members, many of whom do not show up on the members list, that is still 68% of "members" who do not have a single post to their names.