One of the most important things you learn when you're launching a startup is that the product has to match the market, and the market is never "everyone". You don't have that sort of marketing reach on a startup budget. Startups can get the word out through social media (people the founders know), people the founders and investors network with, through startup and early-adopter technology news (TC, HN, BetaList, ProductHunt, etc), through advertising if they have a budget for it, and, for a lucky few, through mainstream news if they're clever.
Social, networks and tech news are all going to be 'iPhone heavy', and although that is changing, it's still enough to make iOS a sensible choice to market to first.
TL;DR The fact that the Android market is bigger is irrelevant if you can't reach that segment of the market with your contacts and/or a very limited marketing budget.
Social, networks and tech news are all going to be 'iPhone heavy', and although that is changing, it's still enough to make iOS a sensible choice to market to first.
TL;DR The fact that the Android market is bigger is irrelevant if you can't reach that segment of the market with your contacts and/or a very limited marketing budget.