If you are selling a physical product, you want photograph of that product that show the color, size, and dimensions. Like most people, you would never order something online if you could not see a photo of that item. With professional photographs, buyers will see how great your product is and be willing to purchase it.
If you do not have a website, you can still use professional photographs to market your products, through social media or on flyers or outdoor advertising. Clean, crisp photographs of your products make them look desirable.