A website is also important because it helps you establish credibility as a business. Most people just assume that you have a website since the vast majority of businesses do, at least the vast majority of big companies do. There are actually still quite a few small businesses that don't have a website and without one this is exactly what they will remain. If you don't have a website that you can refer people to potential customers are going to assume that you are a small time company that does not take their business seriously. Once you establish this reputation it is going to be hard to make sales.