This is an article from October 2016
https://www.autocar.co.uk/car-news/n...rcars-compared
So if we take the BMW I8 first, a 2016 car with 10k miles your looking at about £50k, so 50% less than new.
Mclaren, a 2016 570s will set you back between £90 and £100k so between 63% and 69% less than new.
The NSX, one 2016 model for sale at £87k so 63% less than new.
So has it fallen, my answer would be no. It's just where the market is right now for these cars, if you take a 2016 911 Turbo they have appeared to have faired better (not lost so much money) but you don't know if a car has only £5k worth of extras or £25k!
Am I keeping mine, YES! In fact I was out in it yesterday and what a car it is, with people still stopping to look and stare. I was especially impressed by the two young ladies keeping up with me in a Fiesta over the Dartford crossing.