Dethroning King Gillette: “So to make more money from the songs than from the iPods they’d have to sell 375+ songs per iPod. Apple has sold 250 million songs to date and has sold 10 million iPods. That is 25 songs per iPod, not 375+. How long does a digital song last? If the customer is careful, it should last effectively forever. How long will an iPod last? The life expectancy of a mobile phone is 18 months and the life expectancy of a PC is 3-5 years. I’m guessing the life expectancy of an iPod will be something in-between, on the order of three years. That means Apple can expect to make the profit equivalent of 375 songs every three years from selling a new iPod to each old customer.”