Apple already had everyone's billing information from iTunes... you could buy things just by typing in your password... That, for the first time, brought very, very easy payment to the modern software world. That, more than anything, is why there is a business for paid apps.
Marco ArmentEmphasizing and rewarding length over quality results in worse writing and more reader abandonment.
Marco ArmentWith a Web and iPhone app, I try to find new and tiny ways to delight my customers. They may not notice, but it helps drive goodwill and makes your product remarkable.
Marco Arment