Your assumption doesn't account for the fact that the most common devices are Samsung Galaxy phones which aren't the cheapest on the market. While pricing certainly has an impact on some markets, in others it's more about prestige and surpringly iPhones have lost a lot of their prestige as they aren't far and away better phones than Android phones. They're still good phones and the Apple watch is hands down the best smartwatch on the market. My evidence is based on sales figures year after year. Currently devices like the Xiaomi Redmi and Samsung Galaxy lines are tops. When Apple tried a cheaper line it didn't sell as well as their higher end line. I'd argue that Android dominance isn't currently because of control either, it's because of ecosystem. It's easier to find an Android phone that meets your needs than an iPhone. That because there's only a few iPhones and hundreds of Android devices.