Let’s get the important bit out of the way first: the iPhone X is one of the most expensive flagship phones ever made. It’ll retail at $999 / £999 / AU$1,579 for the basic model.
You don’t need us to tell you that’s a lot of cash for a smartphone – the cost of creating this new all-screen device has meant Apple’s ramped up the price, presumably both to offset the higher development and production costs and to protect its higher margins.