Just for some clarification:
-Even if you started with ORG posting access, you can lose that access IF your reputation drops below 100. That has not happened to anyone as of yet, and is balanced out by the fact that negatives only account for half of the rating "power" that positives do.
-Regarding new posters receiving large amounts of points shortly after joining, there are two other basic requirements that must be met before that poster is given ORG posting access. Besides having 200+ points, the member in question must be registered for a minimum of 30 days and have a minimum of 60 posts before they gain ORG posting access.
-As I said in my original post about the system, it's likely that there will be some tweaking involved. A great example of that is that GIK and I decided to lower the amount of "power" one receives for their number of posts by increasing that to 4000 posts to get 1 extra point. We'll continue to make changes, as we see necessary, so if it did ever get to the point that someone had so much "power" that they could almost single-handedly grant someone enough points to boost their reputation score to 200, or enough to lower someone's from 200 to 100, then we obviously need to reevaluate how much "power" a user can have. As others have mentioned, I don't see that happening anytime soon (including over the new few months). I BELIEVE the maximum reputation "power" that any one user currently has is 14, which would give users that 14 points for a positive and subtract 7 for a negative.
-Mass pruning (that drops a user's post count) should no longer be an issue, as the only time we've seen a significant drop in post counts is when I deleted the duplicate "Be the last person to..." thread. Since those discussions have moved off site (for bandwidth purposes), we won't see that happen again.
Thanks for the good questions and feedback.