Comment by yamtaddle

User count, yes. Expected value per user, and amount spent per user on software and computer services is far lower for Android, even if we only look at the US. That, combined with the relative ease of supporting a couple iOS versions on a handful of devices versus a whole universe of Android OS-device combos, is why a lot of apps go iOS-first if they're not doing dual-platform from day 1. The benefit for most monetization models is greater on iOS, and the cost of support tends to be lower.