In app purchase — a bag of hurt
“But Apple require that this app be paid, not free, in order for us to offer In App Purchase. So lets look at that again, the same user downloads the app for $0.99 assuming it’s a one time payment, then launches the app to find that he only gets 30 days of service for the $0.99 he just paid. Furious he leave one star reviews all over the place even though we went to great lengths in the iTunes description to spell out the exact nature of the subscription and costs (but no one actually ever reads that stuff).”