However to be clear, that percent is in the same area that game consoles and I believe Steam (someone correct me?) charge. And we accept that. When the 30% rule for the App Store came down, our smart phones were basically the same as a game console. Most people did not expect these devices to become the central part of all of our lives. At least not in this way.
Now that it has, than sure the percent needs to be lowered and I am not arguing that (I said in another comment the 30% is worth it for me personally but doesn't mean I am ok with it).