It's the joke that never stops being funny:
Was the painting worth that much? Obviously; someone paid that much for it, hence it's worth that much to someone. Is it art? Sure. Is it good art? Not particularly. But it's a Warhol, which means it has a connection to a certain holy era in American popular culture, and it tells people your tastes in art are not entirely serious, but still contain a cultural critique, an ironic distance from the culture they supposedly celebrate. All that in a picture of a Coke bottle! He may or may not have drawn it; Warhol used "assistants" to help produce his anonymous work.
Sometimes he would project pictures on a canvas and trace them, like this guy:
You could probably send a kid to college on the money you'd get for this, a signed original:
It's an original Warhol Campbell's Soup can. What a talent!
