After being around this site for a number of years, Vee, I've seen a lot of members come and suddenly disappear. Many are very enthusiastic and active for a couple of months, and then they just don't turn up any more. Often some people only turn up during school term times, while others are only around during vacations. A lot of new members have turned up after the release of each of the three films, but again, many of these seem to lose interest after a while. I think this is particularly true with the younger members, who's interests and hobbies perhaps fluctuate more regularly than those of older people.
It is always nice to see a missing member turn up again though.