Depreciation means the value of an item decreases over time. In the case of cars, loss of value is also influenced by wear and mileage.
Premiums tend to increase in line with inflation as time goes by. In addition, the cost of repairs goes up year on year. It doesn’t cost any less to replace the bumper on a one-year-old vehicle than it does on a brand new one. The cost of parts, paint and labour increases each year. Doing the same repair job to the same car will cost more in future years, even though the value of the car is less. In addition, with the lion’s share of claims coming from accident damage, the reduced total value of the vehicle has little bearing on the price of the premium.
While the threat of theft of a vehicle or even a total write-off occurring following a particularly bad accident is real, this risk is far lower than that of accident damage. It is also therefore a correspondingly small percentage of the premium paid.