In 1981, a buyer paid $30,000 in gold coins to buy a 1963 Shelby Cobra. Was that purchase a good investment? The gold coins would be worth three times the $30K, or $93,730 in March 2011. The increase in value of the gold seems like a good deal, but the Shelby sold at auction for $467,500 or 15 times the initial purchase with gold coins. Read more ... I tried once to trade something (not gold) for a Shelby. Guess I should have tried harder. Do your cars appreciate in value as has gold or maybe this Shelby?