The best reason not to do this as a sole proprietor is that the legal liability falls on you (your house, your family, etc). An LLC not only gives you your App

The best reason not to do this as a sole proprietor is that the legal liability falls on you (your house, your family, etc). An LLC not only gives you your AppStore listing, but gives you a legal shield as well if something goes wrong with the business (ie. you don't lose your house).