I think that is not "good" - because the threads will split... one forum for all is better... is always better to listen all the voices... but i think non-licensed members to see what loosing... (i mean fast answers or spoiler with extra source code)
I think must have the option what to limit... not all but specific parts wanna share with specific groups, members... from the other hand there is PM but sometimes need a lot work....
This is also not fair for some people like me. I have bought twice in the past and I do not have the "Licensed green box". So I would have to pay a third time to see parts of the forum of my interests. I promote B4A all over as well, FB, etc.. BASIC is my favorite language of all types.
So I would let people that want to see your spoils see them.
EDIT:
Corrected by Erel, thank you Sir. I like the idea now..