Art ranges in price from $0 to hundreds of millions of dollars, and a common misconception is that it's totally subjective.  YES, it is, but so is food, fashion, music, and many other things in life and there's still a general consensus on what's good quality and what's not. Art is no different, except that in general, people are less confident assessing it because they're not nearly as exposed to art as they are to food, fashion and music.