On average, gamers spend $42.70 on in-game items or virtual currency. A quarter of the survey participants report buying virtual currency at least once weekly, and 55 percent would rather earn virtual currency than purchase items with real money.
When it comes to ads in games, 45 percent are open to viewing in-game ads to earn virtual currency, 42 percent are more motivated to play a social game that offers real-world rewards, like a coupon or gift card, and 41 percent will review the game or spread the word through their social network page to earn virtual currency.
All of those sentiments illustrate growing interest on the part of game developers in in-application commerce, in-app advertising and in-app "currencies" of various types.