All vehicles nominally lose 20-40% of their original value upon sale... but for certain vehicles with high demand, it's a seller's market. That's why Mazda Miatas and Mini Coopers go for so much.

But those are abberations, and it depends on how popular the vehicle is at the time and how popular it'll be in the future. 80's Toyota Corollas didn't go for very much until the whole "Initial D" trend erupted... and before the re-release of the Mini Cooper and the remake of the "Italian Job", it was still possible to find Mini Coopers for cheap.