Here is the difference my friend; I am a member here and have every right to come and go as I please. You come into PSF and snoop and ferret around. I come here logged in every time I visit.
Why can't people visit a board without creating an account and logging in? Most message boards have tons of guests, who are not signed in for all sorts of different reasons.
I would imagine most people don't create accounts on boards if they don't plan on posting.
It's plainly obvious that anybody and everybody on both boards can *see* both boards, and some are reading both boards for any number of reasons. If you don't want unregistered users seeing a board, then it has to be completely password-protected to even view, which I'm sure some boards are.