Virtual Goods Summit London: 10 Essential Features In The 25 Most Successful Facebook Games

What virtual good earned $75 billion in revenue? Michael Kalkowski, co-founder of GameDuell humorously opened with this question and went on to list the 10 essential features that improve monetization in social games.

So what virtual good was it? Michael revealed that it was letters of indulgence, which 15th century Dominican friar sold these to sinners.   These goods were based on fear, and Michael explained that it was emotional triggering that caused people to get up and purchase these goods that gave them peace of mind.

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