When the internet keeps moving forward and advancing, your business needs to advance as well - you need to not be seen to be standing still. Companies which do not own or operate an online business as well as a physical business, are losing out on sales and additional profits.
Reaching your target market in your own area is one thing, but having a website allows you to reach your target market far more broadly. If you can sell your product or service to anyone, anywhere, why limit it to just your physical location?
2011 has demonstrated just this. In the last year Greenleaf has had numerous enquiries about ecommerce websites, and high street retailers especially understand that simple bricks and mortar are no longer enough to keep ahead of the competition.