Do you see how VAT benefits you when you pay it when buying almost any product/service (including the ones from Apple) in your country?
I agree with your taxation stance though, because taxes are not voluntary. AppStore is, I can either pay for it and use it, or jailbreak it and use it, or walk away to open platforms and enjoy their freedom. And if there isn't one, I am free to organise with others and to build my own.
Besides, Apple doesn't want you to pay for it, it wants to get a fee from the developers who use the platform to profit from it. It's either developers who consciously put this burden of their fees on your shoulders, or there's a ridiculous law in place that doesn't allow the developers to put different price tags on different platforms, which results in higher prices for end users.