They're around 1/3 to 2/5 of smartphones in the United States [1] and about 1/5 worldwide [2]. (About 2/5 of people, worldwide, own a smartphone [3].) Meanwhile, Apple captures something like 90% of global smartphone profits [4]. High-end margin leaders sell luxury products.

[1] http://fortune.com/2017/01/18/apple-iphone-market-share-2/

[2] https://www.strategyanalytics.com/strategy-analytics/blogs/d...

[3] http://www.pewglobal.org/2016/02/22/smartphone-ownership-rat...

[4] http://www.cnbc.com/2016/11/23/apple-captures-record-91-perc...

Also, an iPhone is cheaper on a yearly basis than a dog.

https://xkcd.com/980/