MacRumors gets quite a few spambots (or real people posting promotions). When they are banned after a spam post or two, their posts are deleted, and they fall into my "no posts" category. That could explain, in part, why many memberships have no posts. Still, there are people who join without posting, and since they are mute we're never sure why.
Most of the cut-offs are in the
FAQ, but the ones past G5 are left as a challenge for observant users to spot.
Funny story: When I first joined MacRumors, there was no FAQ about user titles. I was just a regular member, with no inside information, but I was determined to figure out the user title post ranges by regularly checking the member list, every so often month after month. I even set alarms for the dates when I expected a member to hit some round number, like 3000 posts, so I could see if their user title changed. Watching those counts was part of the inspiration for the Top Posters Extrapolated project.
Yes, contributors and demi-gods and demi-goddesses are in the categories for their post-count-determined user title, so they are all accounted for.
Your "natural" user title is "macrumors G5".