I found such a thread at AdminFusion! What you do is tell the person above you one reason why you wouldn't join their forum. That doesn't have to be literal; by "Why won't you join my forum?" I just mean what is the forum lacking. So you explain to them one thing you think is weak about their forum and how it could be changed. Hopefully what you say is helpful, not rude, and then the forum owner takes it into consideration and possible improves. Here is my Forum Gang of Wannabe Billionaires Tell me one thing you think could be changed, post your forum, and we'll continue.