If you only want your smart to appreciate instead of depreciate, you'll have to kill the smart's designer (assuming he/she is somewhat famous). Back in 1988, I was offered a chance to buy a used Ferrari (the model used in Magnum PI) for around $30K. As a newly minted engineer at that time, I probably could have made the payments at some pain, but I declined. Months later, Enzo Ferrari died, and that car later listed for close to $200K (it was bought after a furious bidding war).