Hey guy, bad idea in my opinion, very BAD!
Don't move like finalRender or Fryrender forum.
At the start you think this is a better solution for customer, but this block the diffusion and interest about the program.
See VRay forum. All can see the full forum, but only customer can write.
In this way all people, also warez customer, can read and the software and interest spreads more fast.
Just my suggestion, for you