I'm curious what the benefit of removing registered users with 0 posts is?
Main benefit would be that it makes it easier for moderators to spot spambots. Sort by low posts+recently registered and there you go: a list of suspicious user accounts to once over. As a result, most of those random people who registered years ago yet have never posted are only noise that gets in the way.
(At least in my own forum modding experience, the sort by post method tends to work because, for whatever reason, spambots tend to not start their spam on the day they register with a forum. Just speculating, but they probably wait for some signal after their scripts sends out the, "I've succeeded in registering at forum X," notice to command and control.)
Possible secondary benefits:
1. Reduces clutter in the user list. That in turn saves on database maintenance, saves on bandwidth since (A) the user list will now be not nearly as many pages long and since (B) bots, crawlers and email harvesters do crawl the *entire* user list). This also possibly reduces the file size of forum backups, although that could be pretty negligible.
(2) Reduces people who will try to smurf for a rainy day.
On the other hand, manually cleaning the user list would be a lot of short term work. The obvious alternative would be if it was done via a fire and forget script. However, that has its own issues. Whoever wrote it would have to make sure it didn't accidentally ban the wrong users... for example: people who lurk, or (worse) users like me who have low activity levels, or (even) worse people who made valuable posts in the past but no longer post. I'd be pretty sad if a great forum member like Terence Ferguson accidentally got banned over something like that. That in turn involves testing and time which may make the whole idea unwise.
My bet? Chances are Qhimm will step in and say he doesn't have the money or the time to keep hosting+running the forum any more before it gets to that point. Be that as it may I do kinda hope FF7 and FF8 get re-released on GOG, Q-Gears finishes, and Square-Enix puts out a non-sucky FF7 HD Remake, ensuring that this place lives on at least another 10 years. ^_^