This article by Kepa Auwae of Rocketcat games is pretty enlightening if you haven't seen it yet. It's about the experience of trying to make money with Punch Quest. http://penny-arcade.com/report/editorial-article/when-a-huge-audience-isnt-enough-how-punch-quest-tweaked-an-economy-into-pr
Thanks and here's more! Thanks for sharing! On the other side of the IAP spectrum, this article from Gamasutra comes from the unsuccessful side of things: 7 Ways to Fail at Free-to-Play Hope it's helpful!