Customers and potential customers want information, not white space. They aren't interested in how nice the brochure looks. They want as much information as you can fit on the page. You should keep marketing copy short, because people won't read long copy. Yes they will, if they are interested in it.
People read novels, lengthy magazine articles, and reports.
If you give the proper information, and push the right buttons, they'll read it. Marketing should be entertaining. It doesn't have to be. People go to the movies to be entertained and amused. Marketing should sell product.