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Reward Loops
Entry #0612
The reason two in-app currencies are harder to leave than one
Real money buys gems; gems buy coins; coins buy the item. Each conversion blurs the price, until you no longer know what anything actually costs.
Adept
The hidden part
#0612
Every conversion is a step away from the dollar. By the third currency, the price is real but the pain of paying it has been abstracted away.