This is wildly incorrect. $ billions have been transacted as micropayments in social games[1]. The key to their success was bulk purchases of intermediary "currency" that frees players from the mental energy of thinking about actual money (its a sunk cost because the currency can't be redeemed).
[1] Distaste for social games and the business model does not invalidate the financial success of their implementation of micropayments. Note: I started a micropayments company.