As Timthorn mentioned, a high growth rate from a small base isn't really impressive. Last year, it was on one U.S. carrier, and T-Mobile at that. Now, everyone but AT&T has it.

Aside from that, however, Android's tackling a range of devices from the high end tier to what the industry terms "feature phones," devices that hope to tackle one area and tackle it really well (i.e., photos, texting, social media). These are lower margin but higher gross, and for now, completely uninteresting to Apple but Android provides a perfect platform for crafty manufacturers to quickly churn them out.