Blame Apple
Complainers, it is Apples fault there are no in app purchases. Not only do they take a 30% cut, they also forbid you to sell the product cheaper on your site so there is no way to recover that fee. It is a load of crap and if they did it the price would have to go up for everyone. Props for that, and the app is great.
Guilicious about
Comixology - Comics & Manga