I have examined my needs and wants as well as my financial situation, and I have determined that I want it and that I can afford it and that the X will meet my requirements; therefore, I am not "throwing money away". The iPhone is my main, everyday, go-to computer. There, justified.
Wet blankets have been trotting out this line of thinking since the original iPhone (long before that actually, regarding any number of unrelated expensive products). Even when most of the cost of the iPhone was buried in carrier contracts, some asked "how can you justify spending $200 on a PHONE!?". Countless people would say to me, "you spent $200 on that? I got this phone for 'free'". I bow to your wisdom.
How can you justify spending X dollars on a camera, a bicycle, a vehicle, a watch, a TV, golf clubs, a pool, granite counter tops, dog food, tuition, etc? If it's not for you, fine. Don't be so arrogant that just because you can't see spending money on a thing that there's not a good reason for others to spend money on that thing. Some people just love raining on others' parades.
https://www.forbes.com/sites/ianmor...verpriced-its-a-massive-bargain/#1bee66bb2aee
https://techcrunch.com/2017/09/19/review-iphone-8/
(The iPhone X camera will be even better)