A web SITE is a collection of pages with links between them. The larger your site, the more information you can provide your audience with.
Larger sites have a wider variety of goods to sell and have better features built in.
Both current and potential customers around the globe will be able to access your information in a matter of seconds. This is also an extremely dynamic media as one can make a change in the information and have it presented to the public in mere seconds. When used in conjunction with your existing advertising by putting the address in your commercials and on your business cards, the returns are huge. There is only so much you can say in a 30 second commercial. You can say all you want on your website.