The Mac App Store has been a huge boon to Mac software developers, but has an enormous flaw: it needs to allow developers to charge existing customers a discounted price for major upgrades. Right now developers selling through the Mac App Store face a lose/lose choice: either provide all major upgrades to existing customers for free (thus losing a quarter of our revenue), or create a “new” product
![The Mac App Store Needs Paid Upgrades](https://cdn-ak-scissors.b.st-hatena.com/image/square/7d47fd220ddebbcd130e62d7f1f35c4d23dc09eb/height=288;version=1;width=512/http%3A%2F%2Flh6.ggpht.com%2F-ynhoZEeQ64g%2FT3H-QYpP17I%2FAAAAAAAAAHI%2FrhmhzbHvIEg%2Fw1200-h630-p-k-no-nu%2FDL2-Direct-vs-App-Store.png%3Fimgmax%3D800)