I've had my iPhone for about six months and I've yet to find an app that I would pay even $0.99 for let alone $5-$20. Having an in-game upgrade option would not

I've had my iPhone for about six months and I've yet to find an app that I would pay even $0.99 for let alone $5-$20. Having an in-game upgrade option would not appeal to me. I'm likely different from most though - I want my phone for calls, browsing, music, email, and the occasional time-waster while sitting in an office waiting room. I don't want it to replace my computer.