True, in fact, having played World of Warcraft and having observed other players, I think the satisfaction "pay-off moments" can be interleaved with huge stretc

True, in fact, having played World of Warcraft and having observed other players, I think the satisfaction "pay-off moments" can be interleaved with huge stretches of monotonous activity (essentially waiting) - people show surprising reserves of patience for some games. In other words, the happiness of playing that kind of game comes from optimistic waiting, not the "pay-off" itself.