yeah, its totally weird, and whatever happened to el dyablo? i dont think anyone wjho uses the armatar crazynaitor used is still playing. wait, maybe thats like an unlucky armatar or something...
Not everyone who was once in the top 10 quits, but it does happen rather often. They aren't the only people who quit, they are just the only ones who get noticed. I was in the top 10 for a while, and it's been months since then and I haven't quit. It's really just all personal preference.
Some of the top 10 have quit because they were tired of losing points steadily from spamming. The others quit because their profiles were bombarded with comments constantly.