Every now and then I buy for the art, only because I appreciate the style. When I was much much younger it was all about the art, usually the cover art is what sold me. It had to be complex, imagery and moving, if the cover was kickass I was buying it lol.
But now it's all about the story line, it has to draw me back and be worth reading again. There's too many comics with interesting titles and great art but no reading content. My art taste has changed over the years, it went from complex to simplex and my reading went the opposite.