A forum where such a practice is, and always has been, implemented. ie., not VCEnotes. I feel VCEnotes' selling point in that everything can be accessed by everyone. You want to remove that accessibility.
50 Post implementation might be far fetching it, however, 30 post implementation might be adequate or even a 20 post implementation.
Yes, it is a privilege, that resources is accessible. At the same time, through ATAR's idea, posting implementation , say 20 - 30, which is achievable in like a week, we are encouraging more communication within the community and at the same time, promoting the forum by compelling students to participate rather than "get but not give". This also encourages student who primarily were lurkers to participate in the forum. Just as someone who is "not confident" do activities to boost their confidence, it works on the same principle.
Or alternatively, we can stick with what we are now, and let lurkers reign. You choose.