I was just having a quick visit a bit bleary eyed after night shift, but didn't there used to be a 'Become an XT660 Supporter' banner with flashing lights around it at the top of the screen?
Its just that that was what drew my attention to joining up when I first visited. As now the only links or mention to join up that I see for unknowing newbies are the small links at the end of Captain's or Administrator posts?
Maybe a more visual approach to join might raise the kitty a bit?