A pitch isn't just about sales. A pitch is a way of telling your story. More than that, your pitch should be authentic and tell your story in a way that compels others to learn more about your brand and your business, but also shows your excitement about your products and services. If you are truly excited about your business, that will show. You cannot fake genuine enthusiasm.
You need a pitch because a good pitch will engage your audience and make them want to do business with you. Your pitch will help determine whether you get media placement, customers, and possibly investors.