Knowledge is gained by participation as much as by observation. How can you claim to allow free knowledge (allowing non-donators to see the forums) but charge people to participate?
Why do you think the wisest people tend to be the oldest? Because wisdom is acquired by
doing as much as it is by
watching. They've lived, they've watched, and they
done. Charging people to post is charging people to ask questions. It is charging them to learn. It is charging them for the information you pretend is free.
I sure hope
those in power reconsider.