This is just my guess, but Android phones are on average much cheaper than iPhones. An iPhone costs $400-800, the only Android phones in that range are the ver

This is just my guess, but Android phones are on average much cheaper than iPhones. An iPhone costs $400-800, the only Android phones in that range are the very top of the line (Samsung S7, LG G5). Most of the huge Android user base is on inexpensive phones sold for $0-100 on contract. While you can't say for sure that Android users have less money, you can say they're spending less money on their phones which likely means they'll spend less on apps on that phone.