Always be selling is the mantra for the entreprenurs. Enterprenurs must have or acquire skills to sell very early on because entreprenurship is all about selling.
In the beginning, you have sell yourself to leave your cushy life to pursue your dream. Then comes the need to sell your parents/spouse on the idea. Then you have to sell potential investors to buy into your dream, not to mention bringing the co-founders and key employees to help you launch your venture. Then you have to start selling half baked products/services to customers.
Selling never stops as the need to raise more investments, need to hire more people, need to make more revenue never stops. Entreprenurs become a good story teller. They need to exude confidence when things are going nowhere fast. They need to sell future as if it is a sure thing.
It is hard to imaginea successful entreprenur who is not a good salesman.