In the era of technology this question may feel somewhat odd. No matter what business you are having a website is an addon for you. Some of the advantages of having a good website is as follows,
Accessibility 24 X 7: Since website has no closing time your customers can visit your business virtually at any time they wish. It may increase customer satisfaction. All you need is a well-maintained website which can convey your business to customers.
Escape from being invisible: The latest studies says that customers will search their queries to search engines to find an appropriate product or service before buying it either offline or online. If you don't have a website there is no chance to show presence in search result.
Online Brochure: Website will act as an online brochure for your business or organisation, which is much cheaper compared to a printed one. And of course reach of a website is much higher than a printed one.
Business value: A good website will increase your business value. Consider you are trying for a loan bank will definitely consider a website as an add on.
Your Top Competitor Has A Website: All the business are running in a competitive environment and if you don’t have a website, then definitely your competitors with web presence will have an extra edge in business.
Save time Dealing with enquires: Yes website can help you to deal with most of the enquires by just maintaining a faq page. And this will be available for customers for 24X7. Also website can provide a contact page, through which enquires from all around the world, no matter of time can be received to your email.