What is that thing in the PolishForums that keep making you come back...or log into the site, if not daily, than atleast once in a week, no matter how busy you are!
I think the main reason why people keep coming back regularly (even after they posted their "Goodbye, I'll never come back here!" message ;) is that this site is real and 'not censored.' People can freely speak their minds. They come back after having been fed with 'politically-corrected' messages which don't represent the truth.
On other sites if you say something controvertial or your views are not among the 'acceptable norms' or your opinions are not likable to the site's sponsors then your posts can be removed or you as a member will be scrutinized by the moderating team. Here, only those who really go over the board get suspended (and usually temporarily).
That's why we should pray that this site remains ad-free; otherwise sponsors (not admin or moderators) will be the 'stock holders' who determine what is acceptable or not. If that happens, true free speech as we know it will be over.