The only problem with this system (and it's a huge problem) is that new members have no clue that it exists. They see that posts and activity are somewhat related and continue to spam away in order to get signature space. Then they complain why activity is not increasing. The weekly limit is completely unknown unless you are a Bitcointalk regular. Hence a huge number of shitty posts.
New users should be given links to the rules and maybe a FAQ (which I'm working on right now) which answers most of the commonly asked questions. It's really tedious and a complete waste of time having to nuke dozens upon dozens of idiots a day who come here and spam ref links or copy and paste or head straight into off topic to spam one word answers in every topic they can find, then straight into Meta (or usually in the wrong section) to ask why their activity is 'stuck' or how can they become a Junior Member etc.
I believe that there is already an existing thread regarding this:
https://bt.irlbtc.com/view/703657.0Basically, this forum should require all newbies new members to read all the FAQ, before they can post, like with other forums where they need to accept the terms and conditions of the site upon registration. Well, we know that majority of registrants doesn't actually read that anyways. But, it might work on this site to reduce users who keep creating threads and asking the same questions over and over again.