A Picasso will never hit 140 miles per hour. You probably wouldn't want to take a buffer to a Rodin. And last but not least, your garage is definitely not the best place for a Monet.
This is the singular uniqueness of Automobiles as Art. Not only can you admire them from afar-the beauty of their lines, the workmanship, the exquisite engineering-but you can also crank up that glorious v12, feel the heat from the manifold, smell the old leather and oil, and take the old boy for a spin, all the while feeling the wind on your face and the rumble of the engine in the seat of your pants. Try that while looking at that Cezanne you just stuck on your wall.
Collector cars have recently started to come into their own as objects of art, with price tags into the 7-figures becoming commonplace. Of course, your "vintage" Pinto won't have quite the same cachet as a 250 GT Spyder California SWB, but hey, all in the eye of the beholder, right?