Common wisdom in the US seems to be that as soon as you title a new car and drive it off the lot, it loses a massive amount of value in those few minutes.
Why Does a New Car Lose Value After It's Driven off the Lot? - CarsDirect (but this doesn’t seem to actually answer the question!)
I seem to remember, years ago, reading about how a (local?) person had won a “new” car from a dealership as a result of a promotion or something, but the car was actually several model years old and had been New Old Stock that was never sold in the year it was intended to and just kind of languished on the dealer’s lot. The article in the paper said that the person who won it was intending to sell it, but that the very fact that the dealership would be transferring title to the winner first would cause deprecation, and at least implied, if not explicitly asserted, that if the dealer would have been willing to directly transfer the car to the person that the winner wanted to sell too, it would have been worth more to the winner since it would have been sold before ever having been titled. That smacks of superstitious thinking - I would think that the car would have incurred much more wear and tear on former test drives and just being exposed to the elements for so many years and that exposure would dwarf the wear and tear on the vehicle incurred when the winner drove the car off the lot and drove it straight home or to the home of the person they wanted to sell it to.
Why, exactly, does this happen? Is it primarily psychological, in that many people have such an emotional reaction to a “new” car that has been titled for all of 5 minutes to John Smith across town that they couldn’t realistically see themselves paying even 95% of sticker price for it to him, or is there regulatory or insurance pressure going on here that forces the value down?