Having some knowledge of practical shareware economics, this seems to me to neglect that the 100th most popular Mac shareware app will have significant revenue next year barring black swans or the programmer removing it from the market, but the 1000th most popular iPhone app is at the mercy of a hideous sales trajectory.<p>The main drivers of sales in shareware all get better with age, which is the exact opposite of the main drivers of sales in iPhone apps.