It goes like this:
Members will develop their own curry recipes and go to the trouble of documenting these recipes on the forum.
Members will also freely give unconditional advice and support to others, driven purely by a shared love of curry.
At some point the forum owner decides that everyone should pay a tenner a year to access the forum content.
Members who gave freely wonder why they should pay a tenner, simply to view content they have freely given to the community. Few (if any) of the knowledgeable curry experts pay the tenner.
The only question is, what happens next,.....