a) it attracts developers and other content providers, and b) it is a reflection of device popularity (i.e. if a lot of people think it's a good device, there must be something to it).
Except that a) iOS has a dramatically healthier app ecosystem, and b) the poster even points out that most people who buy Android phones don't care about the platform.
Sorry, but the 'Android is dominating' meme took a sever credibility shock with the last round of Android handset manufacturer profit slides. But you know, they'll make it up in volume. Or something.
