I think the determining factor in this is the age of the model, and the type of car it is.
Supercars are very sensitive to mileage because of varying contributing factors that keep mileage down for most owners:
1. A lot of owners are incapable of driving one without connecting it sooner or later with a solid object in a car-unfriendly manner. A lot of them are smart enough to know this and therefore don't drive the cars very often, nor very far.
2. A lot of the value around these cars has been driven up and down by speculators. They buy the car with an interest in making money on it, and consequently they are not interested in driving it at all. The lower the mileage, the higher the value (for most people), so not driving it seems a smart thing to do.
3. Age. The supercar era is relatively young and there is still, although every year a little less so, on average a direct relationship between mileage driven and condition of the car. This makes the cars more attractive for naive buyers with a lot of money. When the car is older, they don't feel they have the knowledge to ensure they're making a good buy. So they buy a younger model with low mileage, even though it may be in poor driving condition.
For non-supercar models that are relatively recent, a similar principle applies. Low-mileage = high worth. This is because people who buy, say, a 550 for $100k want to imagine they've got the status and buying power of someone who bought it new for $250k. The newer it looks (i.e. the lower the mileage), the more real the illusion is. Also, if they plan to resell, it is easier if the car had lower mileage to begin with. What you've added is then not such an issue. For me, this was important. I didn't want the car to have much more than 20,000 kms on as I planned to do quite a few myself. The one I bought had 23k but was in great condition so I wasn't worried.
On older models this does not matter so much any more. Quite often it is impossible to tell how far the car has really travelled, anyway, so it is better to focus on the actual condition of the car.
So, in short, I think the rule of thumb is - the closer the date of manufacturing is to today, the more important the mileage.
Onno
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