If everyone was always renewed, and new people continue to meet those mysterious qualifications, the number of CK members would grow and grow. This doesn't make sense. So someone has to lose CK from time to time, just as people at other levels move down.
As previously posted, what did you do before that you didn't do in 2007?
(I didn't like losing EXP either, but at least there the criteria are published so I had several months' advance notice to get used to the idea.)