Why do you get to decide 30% is too much? You do know the majority of digital stores take 30% right? If you are for changing that for Apple, how about Steam, Xbox, Playstation, Windows Store, Google Play store? Should those change too?
(before COVID) I find a 12 pack of Soda way more expensive than 10 years ago (and it actually did increase).
Go ahead, sign up for a CDN that helps make your download faster anywhere in the country and world. I pay the CacheFLY bill here, and it get very very expensive, and I am not that popular and get a lot of downloads.
Apple's 30% offers A LOT to developers. They do not just take 30% just for giggles.
Do you want to remove the 30% but pay $1,000 for Xcode, developer license, APIs and stuff like that?