How about an online test to obtain membership?
I would hate to see too much forced change/active management to filter the user base, as I have learned an astounding amount from the links, the comments, and my observed behavior (compulsion/obsession?) with the site.
This is my first post, and so far, I have not had any content links to offer. I, for one, would be disappointed if I did not make the metric to continue to read/learn.
(Edited for correct grammar - sorry.)
4 points minimum is a start.