After release my first iPhone application I had a fairly decent turnover in turns of sales considering it was a pretty niche application in the health and fitness category. However, I decided to make the application free until the next update and in the first 3 days downloads of my app have increased by 1433% - which is quite staggering.
So it got me thinking maybe the option of a free application, with ads would be a better option. With that said, what are the available options for integrating ads into an iPhone app and which is the most profitable?
iAD is the most profitable as it pays lot per impression, but they don't always fill the slot. The best thing you can do is to implement some service like AdWhirl which will fill the empty slot with another service such as JumpTap or Admob when the iAd slot does not come through. You can adjust the frequency of each ad network to your liking as well, so if later, you decide that JumpTap should be shown always, you can adjust it from the web interface instead of pushing a new version of your app.
The best solution is to use iAds now that Apple has prevented other ad networks from device-tracking.
来源：https://stackoverflow.com/questions/7148686/available-most-profitable-ad-system-for-iphone-app