By that logic, why don't Macs outsell the sum of Windows machines? If people buy Apple devices for the quality, Macs should outsell Windows machines 5:1.

In reality, I think it's well understood that 95%+ of customers (for Apple, Google and Microsoft) don't make any evaluation of device quality. They buy whatever they see their peers use, because they want to identify with the [luxury|convenience|hardworking] lifestyle of their comrades and idols: https://en.wikipedia.org/wiki/Keynesian_beauty_contest