This is common for all cars of all makes. You want people to buy new ones so there is an areg where old cars are a liability. People buying new cars trade them in after three years, so you want some value left so they can afford that, but you want them to wear out in about 12 so that people have reason to keep buying more instead of keeping the old. Then after about 25 years it is a collectors car and you can be proud of the few left - they are not impacting new sales much (if any) and give people reason to dream about cars.