There are a number of app stores out there, Apple, Palm, Blackberry, Windows and Google all have app stores but there is one key difference with the Android Market the revenue share model. All the other app stores give a proportion of the revenue to the developer 70% to 80% with the remainder being passed to the app store owner. Google however has waived its revenue and instead that the 20% to 30% goes to the mobile operator providing them with a way to make money from not doing anything at all.