You make it sound like any idiot can just piss a bunch of random shapes and colors on to canvas and make money as an artist. That doesn't happen. Most artists can barely make beer money selling art.

If you're already famous for real art (abstract or otherwise), then, and only then, you can start selling stupid crap like soup-cans and blue squares. But if you or me, tomorrow, just start trying to sell some random hodge-podge of shapes and colors, we won't even get our work shown at a gallery, much less sell it for real money.

Art sells based on the name attached to it, not the shapes and colors.