Imagine an investment whose value has risen 30 percent during the past 10 years, is timeless, and more stable than virtually any other asset class. Add to that an asset that you can actually use and is more fun than just about anything you can legally do. For many, though, collecting classic cars isn’t just about the money, according to Motorious, a site for collectors, restorers, industry experts and the all-around car-obsessed.