It looks great on your business card and gives your business an added air of authenticity. They don't call it the World Wide Web for nothing. The potential is there to reach markets that you never knew existed. Right now most of your competitors don't have an Internet site. It's a nice edge to have.
Nothing is perfect.
While an Internet Site is inexpensive, that doesn't justify throwing away money on something you simply don't need. Here are a few things that the Internet does not do well. Even as more and more people get on the net, the traditional media is far more effective. Internet Sites can sometimes be devilishly hard to find and they rarely attract accidental traffic. If your site is poor, it reflects badly on you.