How big is the gap between customer and die-hard fan? In other words, between engaging and loving, between attending and craving?

For World of Warcraft, it's huge. It's very difficult to spend just an hour or two. There's a chasm between encounter and enjoyable experience. Tetris was oriented in precisely the other way--everyone who tried it instantly became almost as smart as an expert.

If you want to be an insider at the Four Seasons restaurant, you might have to go thirty times and spend $3,000