Here's a little story / timeline from 2009-2010 (from my perspective as a dev on Kindle for iOS):
* we submit the Kindle app ...including an in-app bookstore... to Apple for initial app review
(Note: multiple ebook readers with in-app bookstores are already on the app store at this point)
* several weeks pass with no response
* Apple announces in-app purchasing (to be released several months later)
* Apple rejects our app: we have to give them a 30% cut of all sales through the app, or remove the store and all references / external links to it. We chose option 2.
* Apple forces the other ereader apps to remove their stores or go with IAP. Several (most?) just gave up and pulled their apps entirely
* Apple negotiates agreements with most of the major book publishers that if they want to sell books on iBooks, ebooks must be listed at the same price on ALL stores, and have a 30% margin
* Apple launches in-app purchasing and the iBooks store (with the iPad announcement, IIRC)
...aka even if we (or any other ereader app) wanted to sell books via our app, the terms Apple set forth effectively meant that ALL profit from those sales must go to them (and we would have to eat the bandwidth / service costs on top of that)
* we submit the Kindle app ...including an in-app bookstore... to Apple for initial app review
(Note: multiple ebook readers with in-app bookstores are already on the app store at this point)
* several weeks pass with no response
* Apple announces in-app purchasing (to be released several months later)
* Apple rejects our app: we have to give them a 30% cut of all sales through the app, or remove the store and all references / external links to it. We chose option 2.
* Apple forces the other ereader apps to remove their stores or go with IAP. Several (most?) just gave up and pulled their apps entirely
* Apple negotiates agreements with most of the major book publishers that if they want to sell books on iBooks, ebooks must be listed at the same price on ALL stores, and have a 30% margin
* Apple launches in-app purchasing and the iBooks store (with the iPad announcement, IIRC)
...aka even if we (or any other ereader app) wanted to sell books via our app, the terms Apple set forth effectively meant that ALL profit from those sales must go to them (and we would have to eat the bandwidth / service costs on top of that)