It's simple:
1) Build your app
2) Publish your apps to app store(s)
3) Pay the setup fee
4) Get paid royalties

With AuthorMob, selling your books as apps is easy and efficient.
It is designed for ebook copyright holders of all sizes, from authors with a single title, to publishing companies with thousands of titles to manage.
Start by opening a free account and log into the app builder.
Overview of Distributing Ebooks as Apps
1) Build your app
Use your existing EPUB ebook files. Simply upload them to the app builder.
AuthorMob Social Book Store app, a full featured app that enables you to:
After a few minutes of uploading your files, you will be able to preview your app in your browser.
Get started by opening a free account.
2) Publish your apps to app store(s)
When you decide that your app is ready to go live, just click on "publish" and AuthorMob engineers handle the entire process of submitting your app to the Apple App Store, and soon, the Google Android Marketplace, and the Amazon.com Android App Marketplace.
Getting apps approved and available for sale can take days or weeks, as it's dependent on the policies of each app store, so plan timing accordingly.
3) Pay the Set up fee
Only once you publish your app to the App Store do you pay the set up fee, starting at USD $99.
High volume publishers may qualify for the discounted Best Sellers Program. Please see the pricing page for full details.
4) Get Paid Royalties
AuthorMob sells your apps and pays you royalties of 50% of the retail price of all sales. (Most app stores retain 30%, and AuthorMob 20%) Payment is net 60 days. Read more about royalties.
5) Grow Sales
AuthorMob has developed many ways to market your app and grow sales. Please see more about promoting your app here.