Do Apple App Store and the Goodle Android Market have fees for putting apps up (like say, they take 10% of each sale for themselves)? Also, when you put them up, are there options you can choose as to what payment options are accepted? IE, I recently tried to purchase the game Snail Buster but it would not accept Discover Card. With that second question, what "options" do developers have when submitting apps to the store/market? Thanks in advance for any help.