The marketing you don’t do becomes your reputation and your brand. Take for example your neighbor who doesn’t comb his hair. He’s making an impression whether he knows it or not.
Similarly, a company that doesn’t care much about how it’s products are presented risks leaving the impression that those products are nothing special.
If your competitors promote themselves using an outdated web site, hacked up power points, and crumpled catalogs, what reputation could you build by presenting your products using modern selling tools? And combing your hair.