If you have a F2P game app averaging 50€ revenue per user per year and you introduce a limitation to 1M users, you can avoid the Core Technology Fee and end up with 0€ fees, as opposed to 15M€ yearly fees under the current terms.
If the average user buys a couple of books per year on it, avoiding 30% may be worth €0.50
> Reduced commission — iOS apps on the App Store will pay a reduced commission of either 10 percent (for the vast majority of developers, and subscriptions following their first year) or 17 percent on transactions for digital goods and services.
I'm also not sure what the 10% fee applies to. Apple doesn't charge a fee if you're purchasing physical goods, only digital goods (that's why you can buy a paperback book on the Amazon app but you can't buy a Kindle book on the app). Isn't everything that could be purchased through an in app purchase or subscription a digital good or service?
If the arduousness of setting up a store, and complying with all the various components of that is a stick, this is the carrot - we'll charge you less for keeping in the App Store.