I've been here longer, and I have to say most people leave because of bickering about whose treatment plan is right, whose is idiotic, being accused of lying about their cures, etc. A smaller group leave because this isn't a very productive group as far as collaborating and coordinating actions. Many come back, since this is the most-trafficked forum out there (aside from the Chinese forum) and who knows when a cure claim might show up.
We all gotta get on with our lives one way or another. Stepping back from obsessing about this forum might just be part of the cure, or it might stop us from finding out the cure to our own condition. Better start learning Chinese.