Given the lack of responses in several months following your post, I suspect there are not many people at 18, if any. With no current incentive to get #16-17-18, it would be nice for Hyatt to offer some benefit, for example wipe the slate clean once you reach 15 and allow you to re-earn 5, 10, 15? It would probably not cost Hyatt a whole lot to do so given the very few who have reached 15. I doubt it will happen, just wishful thinking on my part. I think in reality Hyatt probably expects to acquire a couple of brands in the next few years making #20 attainable.