What does the new Mac App Store mean for all those shareware apps? If I am not mistaken, iPhone/iPad apps offer their upgrades for free, so users pay once and then receive all further updates automatically. This does not sound like a very sustainable business model, as you cannot make repeat business with happy existing customers and are forced into acquiring new ones, no matter how large your existing user base is. Will Mac Apps on the store be forced to follow this same model of offering all future upgrades for free to existing customers and hence maybe having to release a "new" app to cash in on any major upgrade (i.e. from version 1.3 to 2.0).