I have now played Civ IV for about ten years, on and off. I play quite a bit, sometimes a lot, then take breaks for some months again. The really strange thing is: even though I've played the game for a long time and have won many Deity wins already, the game still holds new situations, new things for me to learn, new strategies. It isn't boring yet. How can this be? I am not a "gamer" - I hardly play anything besides Civ (though I used to). I don't know anything about Civ V - if it's good or bad - and probably won't know anyting about VI either just because I'm not bored with IV yet. From a business standpoint, this game is probably one of the worst ever because why would you buy another one? I'm very aware of the many flaws of IV - war AI, diplomacy, UI - but I'm still in awe of it. You all know that this game is good so I'm not sure why I am even making this thread but there it is.