Andy Warhol's pop art paintings were a big hit in the 60's. The style was bold. The colours were vivid. The silkscreening method he used to create his prints reduced shapes to simplified areas of colour much the way vector imaging is done by computers these days. Andy could knock off multiple copies of his artwork which proved very profitable.
If somewhere in his career he had ventured into doing big bold dry stone art installations, instead like another famous artist named Andy, he would have had to be content with one-of-a-kind art. Of course he could charge a lot more money for his donuts, but just couldn't make as many.