I don't want to argue about Android vs iOS at all. You should buy what you like, I just provided a couple reasons why I use Andoid. I'm assuming your numbers are worldwide since you did not provide a source. If they're US centric, I'd be very surprised. Living in the US, I know plenty of people with Pixel 3s and S9s. These people did not buy these expensive flagship Android phones because they were cheap. There are plenty of valid reasons to buy them.
If Samsung were selling high end Android phones in volume, how many cheap crappy phones are they selling for the ASP of all of their phones to be $250?
I don't know how many expensive phones Samsung sells, but Google hardly sells any Pixels at all. Last time I checked, they made up less than 1% of Android handset sales.