You want to stand out from the crowd (and not just for low prices) and win higher-profit jobs based on perceived quality of work, expertise, and reliability.
But relatively few contractors have the time to learn professional sales and marketing skills. Most owners came up through the technical ranks, either apprenticing on jobs or learning the business in the office on the fly. By the time they establish their own business, marketing presentations can be rather haphazard and may not show the company to its best advantage.