World of Warcraft has a pretty big footprint: we try to create a world that appeals to casual and hardcore players alike. There's a whole body of players -- be they casual or solo gamers or serious gamers with time constraints -- who gravitate toward questing. It's the most accessible part of the game. Quests move you through cool locations, allow you to play through epic stories, and continually reward you without requiring a lot of practice or commitment. Not everyone has the time to raid, and not everyone wants to; for many players, quests are the whole game.