Apple apparently makes millions, though that is still a small percentage of their overall revenues. Apple charges 30% on the sale of every iPhone app. Close to 1.8 billion apps have been downloaded. 13%-21% of all apps downloaded are paid and the average price of a paid app is $3.
Projecting all of this, Apple should be making close to $240 million to $440 million every year.
The web developers on the other hand could be making close to $560 million to $1 billion every year.