Yes! There is no doubt that a website will benefit you, but to what extent is the question. There is absolutely no down-side to a website, none whatsoever. Please, I need to make this very clear! A WEBSITE WILL BENEFIT YOU!!!
How will it benefit you? As discussed above, a website not only contributes to the image of the business, but is also a great cost effective marketing tool. There are millions of users not only internationally, but more importantly localy searching for your business on the internet, guaranteed. You can say what you want, but advertising in the Yellow pages (that big yellow book that everyone has next to their phone) is worth every penny. But if you must spend the same amount of money online, it will be worth every dollar!!!
So in closing, yes, you can not go wrong by getting a website! It will benefit you.