Why? Those dreaded "bay-bees" and the poor moderation. And also the snobby "preps" and the annoying vampires that go "bites" or "bits" or whatever on you. And DON'T forget the iceberg-tippers and the unnecessary chat-filters!
Club Penguin... that name brings me back. I used to play that game several years ago, when I was about 8 or 9. I remember I was quite addicted to that game, too. I would play all the minigames (though the cart ride minigame was my favorite :3), I would buy tons of furniture and clothes, and I had plenty of friends on there, of course.
T'was a fun time, but, as time went on, I became, as some might say, too old for the game. I slowly outgrew it, and it became less and less interesting for me. I started moving on to other games, and I ended up moving on to my next big addiction, RuneScape!
All in all, Club Penguin was fun while it lasted. I just outgrew it