Therefore investing in cars and property well earn you more than stocking your money in the bank.
But you have to pick the right cars and the right property.
Yes, you must pick exactly the right cars, and also the right time to own them. Other factors include carrying costs, such as warehousing, insurance, registration, and upkeep. In order to retain maximum value, a car both needs to be pristine, and in useable condition - two constraints which do not necessarily harmonize. On the 2000GT, Perhaps you'd pay 1/2% of it's agreed value per year to insure, so that's 5% over 10 years. Plus $100-$200/mo to store it.
At $600K, there's room to make a little money, but you'll owe a good chunk of your upside to the government upon sale, plus whomever buys it will end up paying sales tax as well, causing downward price pressure. Still, better than losing money.