I'd guess perceived status. That, or, they want a tank: another arms race for Baby (Crushing|Saving) Machines. Modern cars keep growing.

I've bought exactly one new: will drive it until the wheels can't be put back on. Before that, probably a dozen second-hand. I now make silly amounts of money, am American.

All this to say: used cars are best cars. Terrible purchasing experiences await regardless.

edit: "In for a penny, in for a pound", right? :)