Skinner boxes like WoW are extreme examples of trying to make you play for as long and often as possible. So when dying, if your choice is between quitting on a

Skinner boxes like WoW are extreme examples of trying to make you play for as long and often as possible. So when dying, if your choice is between quitting on a low or grinding a bit more to get at least a bit of satisfaction out of the session, I suspect a lot of people will do the grind.