They can take whatever percent they want while also letting developers use alternate payment processors.
Or even better, allowing users to opt to install apps from other app stores.
Or even better, allowing people to buy other phones
The arguments are well-repeated by now, but your comment is analogous to saying if I buy a Ford, I can only fill it with Ford gas. It's OK to have laws that prevent and forbid that because it's not good for the people.
The gold standard for fair prices are those set in a competitive marketplace.
CC companies charge about 2.99% + $.30 transaction fees.
Marketplaces (as a startup type) typically charge between 5-10% and survive off that.
30% is outrageous.
The most expensive payment gateway I have ever seen is Paypal, which charges 2.9% of the sale. Apple is acting as payment gateway, yet they are charging over ten times what a payment gateway would charge
0 if they insist to be the only app store on the ios platform and to sign every piece of code. Otherwise whatever they feel like.