[pwntifex]

While 30% seems like a pretty ridiculous number, I don't think there is enough data yet on if Facebook credits will hurt app profits or strengthen them.

One of the nice things about Apple's app store is you just click to buy, you don't have to worry about giving your payment information to individual app makers. I buy many more iphone apps than I would if I had to enter payment information for each of them. Many of the smaller app makers I'm not sure I would trust enough to give payment information to. Many also use more trusted 3rd party systems like PayPal, but they aren't one click experiences which diminishes conversion.

If Facebook credits become the norm and are widely adopted, there could be a significant uptick in consumers willing to pay for apps from the 1-3% which is widely circulated.