So-called Passion investing - allocating wealth toward high-value collectibles - has been around for about 10 years and is now expanding into the classic car arena. 

Classic cars are gaining attention due to their nearly 500 percent returns over the past decade, outpacing art and wine by more than 100 percent, as reported by the Knight Frank Luxury Investment Index. 

"In my decades of of doing this, I've never seen collector cars recognised so universally as alternate assets and works of art."