Knowing how to present, negotiate and sell are critical skills for your overall success. Even if you are not in “sales” you should know how to sell your ideas, plans, products, services and so on. This also applies to yourself as you navigate your career and look for new opportunities.
Furthermore, quality of a product or a service is essential, but don’t ever underestimate the need to know how to effectively sell that product or a service as it will make a huge difference.