I don't let it bother me. On the day I joined there was quite a big Argument between Monalish and another member about a proposed legislation to ban tarantulas. It ended up in Mona leaving completely.
I've seen the following dissapear completely:
Fangs
Cenotaph
Frootbat (if you don't know who that is then you're not a T keeper)
Scarab
Ceratogyrus (Countless times, but he always comes back)
Probably others as well
But to be honest, I can't say I'm sad that so many people are leaving, there are some that have left that didn't like me and I didn't like them, so in some aspects, I'm a happy camper, I'll still probably be here annoying the crap out of everyone even if I'm the last member online
"We choose to do these things, not because they are easy, but because they are hard" - John F. Kennedy
Fidentia est ultimum potentiae
Vigilo
Confido