Facebook runs promo to convert game players into paying customers

The promotion is aimed primarily at players that have never made in-game purchases with Credits. By offering 50 Credits for the price of 10, Facebook can lure users into inputting their credit card information and getting accustomed to using the social network’s virtual currency. Once users add billing information to their accounts and experience the in-game advantages that come from spending Credits, they are more likely to buy virtual and digital goods within applications.