One of the chief reasons that new model lines are more expensive than low mileage used vehicles is the huge amount of marketing and advertising that they receive. Both manufacturers and car dealerships spend a lot of money on marketing and advertising their new vehicles.
At one point, the idea of driving a reliable, high-mileage used car would have seemed outlandish. However, high-mileage vehicles are becoming more and more common these days.
Like other German luxury models, Audi models tend to have higher levels of depreciation. However, according to Motor Trend, several Audi vehicles have slower depreciation than their luxury import competitors.