If the 2018 X costs $900 brand new (since rumors have the X Plus starting at $1000), that immediately puts the 2017 X at $800 brand new (although Apple would just discontinue the X but other retailers would discount the older model by $100). That means the X is already at a $200 devaluation for a brand new device. So realistically you're looking at $600-$700 used but I personally would lean towards $600 because if someone is paying $700 for a used 2017 X, you might as well pay $100 more and get a brand new one.
Exactly, very good analysis. OP hoping for 20% loss on a year-old device is unrealistic. 40-45% loss would be around what to expect, maybe a bit less (lost) if it's in really good/pristine condition and you know how to sell it well.
I'm hoping to pick up a used 256 GB iPhone X myself, since Apple almost certainly won't offer that configuration in the X after the new X (whatever it's called) comes out and I certainly won't be able to afford the new one in that capacity. Apple may even drop the 2017 X entirely this year.
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