“A recent survey by Park Associates found that while only 5 to 10 percent of the player base of social and free-to-play games regularly pays out of pocket, those who do pay are generous. The average Facebook gamer who spends money on games spends about $29 per month, according to the report. And those who pay for virtual goods and upgrades in free-to-play games average about $21 per month.”
Planet Postmoderna will be using an active virtual currency within the game and virtual world. Entropia Universe has been using a real cash economy for quite some time. Amazing that the concept is just catching up and through casual games.