I suggest people read this article that lists fee percentages for 11 different stores from Apple to Google / Amazon to Microsoft.
appradar.com
Just about every item you buy in a physical shop or online has a 33% markup in it or a whole lot more, recommended retail price is only a guide.
Just read the article.

Google and Apple app store fees, (+12 other stores) ?
Let's compare fees for some of the biggest app stores.
Just about every item you buy in a physical shop or online has a 33% markup in it or a whole lot more, recommended retail price is only a guide.
Just read the article.