Damian, your thread has hit a chord with me. I was constantly baffled with the low participation of lower tier players within the CC even though I'd put up prizes (clubs or balls). Some find this game and move on after a month or two. Some stay for many years and they're the ones you want to recruit, but there is no way of distinguishing between the two when as an owner you are asked for acceptance into a CC.
I think the problem is new lower tier members can feel a little overawed with the scoring of the top players in the established CCs. What I'd say to those lower tier players is talk to the owner and ask if the CC you're about to join offers tier specific competition.
I'm afraid to say it, but I wouldn't recommend a tour pro jump in and join a club full of champion tier players right away. I'd suggest they join a lower tier club.
If that club works out, then all the members progress in standard at roughly the same pace. You've found your family.
When I joined WGT, I looked in awe at the members of The Deviations and their stats, BolloxInBruges was the top player back then (he's still pretty good :) ). However, I just wanted some friendly competition so I joined Bridgestone. Over the years, the gap between Bridgestone and The Deviations closed. This , I'm sure is the reason new players should join up and coming CCs, like Texas Lone Stars, Craven Dale or WGT PinHunters. However, I feel that the top players in those CC's should move on and find a new challenge. If you're a champion player in a club full of legends, maybe test yourself in a club full of champions, there are plenty of CCs full of them.