Are you selling products or services? Well then, yes, you should definitely have your website content localized in various languages – if you want to reach future costumers in their countries that do not speak English or do not speak it well enough.
Nowadays search engines make it more than easy to find anything you want or need on the Internet, and most naturally people are searching in their own languages. Yet, when they are, for instance, interested in one of your products and, unfortunately, cannot read (and understand) its description or the checkout procedure, they will leave your website after a short glance instead of browsing it and maybe buying another of your products. Some may not even consider clicking on your website’s link when they see it is in a language they do not understand.
So you miss out on possibly generating more revenue.
What you need is a professionally translated website that reads as if it was written naturally.
So what are you waiting for?