What is so addictive about this game. Its such a simple game, yet I find myself coming back to it over and over again. I'll stop playing for a few months but as soon as I start thinking about it I have to play it and continue to play it for a few months before stopping and starting up again a few months after that. I guess this is one of the few game I might just have to go get the expansion packs for. Just wondering if there is anyone else addicted to this game.