Out of dopamine

Yesterday I wrote about the idea that games of advancement which aren't inherently fun, but only keep people playing with a dopamine rush, will hit problems once players get less and less receptive to that dopamine. There are indications that this is already happening. The world's biggest dopamine pusher, Zynga, is facing decreasing profits. Their $ 306 million of quarterly earnings are close to what Blizzard makes with World of Warcraft, but their profits are down to a measly $ 12.5 million,

World of Warkraft...