Very interesting... My guess is because you've played for so long, it is quite hard to officially leave but I don't know that's just my assumption

Personally I have been playing for years too and only one of my friends, my 'brother' still plays and even that it just occasionally. And yet, I still find myself coming on the game every now and then even if it's only for a few minutes... but now it's getting tiring if you know what I mean...