You don't think car makers have a vested interest in there being a robust secondary market for their cars? If I have a choice between a $50k car that will have a $25k resale value after 5 years, and one that will have a $10k resale value, that's a strong incentive to buy the former. That's another $15k in my budget for my next car, and if I liked the last one, there's a good chance that money is going right back to that same manufacturer.