Neither do many founders and executives of American companies. Snapchat is a prime example of a company/executive neglecting Android for years, at their own expense. Their international growth was extremely hampered until they finally refactored their Android app pretty heavily.

Generally lower wages, and a lot of people here dislike the "walled garden" approach to hardware.

First one is more relevant though I think. Even the flagship Google phones are substantially cheaper than an IPhone. You can get a Xiaomi phone for 100€ that does everything a smart phone needs to do reasonably well.