At DevDays last week, Dermot Daly replied to a question about ‘other mobile platforms’ by saying that the amount of money changing hands on iPhone is enough for most people to consider but the important point is that the falloff in money when you go to other platforms is so severe that they’re not work considering yet unless you already have a customer who’s willing to pay for the effort i.e. if there’s not enough money in iPhone then there’s definitely not enough money in any other platform.
But you also have to look at the engagement. Hyper-local review site Yelp state they have 32 million unique visitors from all sources and only 1.4 million of them were iPhone users which sounds tiny. But those 1.4 million users were responsible for 27% of Yelp searches, they make calls to businesses once every 5 seconds and nearly a million people used Yelp’s iPhone app to find directions to businesses in May.
So aim for deep engagement, aim for people to carry you around in their pocket, make it easy for people to use you and they will use you.