Without class enrollment, or selling more than you spend, your business is doomed. By having an online presence you allow for the registration and payment of your classes or services around the clock to whoever whenever with no or hardly any limitations; Unless you run out of room in a class or out of something in the pro-shop, but thats a good problem to have right! Giving your business the online presence it deserves is crucial to your brand and accountants smile.
In short, being visible worldwide means you are very likely to gain more customers. The more customers and visitors you have, the more sales you will generate. The more sales you generate the happier you and your shareholders will be!