I don't know if much of this is feasible, and it may already have been mentioned in another thread at a different time, but I think we just need to limit registration to this section of the board, period.
Maybe each month, grant only a set number of new members the privilege to both view and post in this section of the forum. How to select these people could be done a variety of different ways. One would be to have new users that want to join put their name on a waiting list and every month, the first 3 or 4 or 5 on that list are granted access, so long as they have a certain post count and have been a participating member in other parts of the forum for at least 30 days. While more restrictions or guidelines could be set for new members just picked - such as participation expectations for the first month, whatever the process, once these new members were picked and let in, they would be full members for good (unless banned by Mods for failing to follow rules, trying to scam etc....).
While this 30 post minimum was a good idea in theory, it hasn't translated quite as well in practice (is it still even 30 posts?). Especially once I saw several people on here with post counts just slightly over 30 that became a member of the forum just a day or two beforehand. I'm not suggesting that it be made impossible to join, view and contribute to this forum - there were no post count requirements when I joined - but it is completely obvious that things have changed since then. Go ahead kill me for making this analogy, but the Constitution (yes, I'm going there) certainly covered many things well at the time, but there was an understanding that, as time passed and things changed, there most certainly would be a need to amend certain parts of what was written to keep things working as efficiently as possible, and to address any problems that may arise with the onset of time and progress. (Ok, enough with that analogy).
Point being, things have changed. And if new people want to join, I don't think waiting for a period of time is unfair at all. Besides, isn't that what the minimum post count rule was supposed to do anyway? The thinking was any new members coming on here to quickly get a vendor's contact info, info on prices, payment directions etc... would realize that wasn't gonna work here. They'd see it takes 30 posts just to get to the section, and therefore they would either go someplace else or - if they were serious - maybe visit other parts of the forum, learn how to become a contributing member in those areas and only then, after maybe 10-14 days of constant contributing (which breaks down to 2-3 posts per day), would they be granted access. But like so many good ideas on paper, this has failed in practice.
Anyway, like I said before, I'm not sure how feasible any of this is. But I do think that something else needs to be done regarding the relative ease with which anyone can not only become a member (with the ability to post and send/receive PMs), but the ease with which anyone can just view this section.
At the very least, the # of new members allowed to view and post, the frequency with which they are allowed to join, and the guidelines they should be expected to follow while here need to be controlled much better. I really don't think any of that is unfair or unreasonable. And I'm betting it would improve this section of the forum tremendously.