I am laughing my ass off right now ....
See, not long after I post about the decline here and make a suggestion ... this comes out.
Instead of taking away from the newcomers for simple rewards, why not just ask them to make an 'Intro' post and answer a few community questions. Then, a MOD could manually approve them to see spoilers.
Communities are built around relationships. Relationships can only thrive if people put themselves out there.
There are so many other ways to increase engagement. If your purpose was to prevent leaks, why not just offer things like Mystery Pic to VIPs?
If you want valuable post count to increase, give people a reason to chat.