Marketing literally helps to sell your product or services to potential consumers. If done right, it gives a product or service a much wider coverage thereby keeping and attracting new consumers.
Marketing helps put your business out there. A strategic marketing team would strive and likely succeed in giving your business a wider audience as shown in the example in the OP. A business that has plans to grow, expand and succeed in the labor market would definitely want people to know about them.

Having quality products and services does help in retaining consumers. Reaching out to and getting these consumers is what's needed to be done and that's marketing comes in.