Actually, you can do a lot more with Wix Code, and make a site with all kind of custom functionality, including 'a way to take orders online and get people to buy their special offers and refer their friends through social media'.

But to use Wix Code, you will need to know some level of coding, hence value to sell for your clients.

And I agree, there is a huge market for people to build websites for customers, you need to focus on the value you deliver to your customers, from design all the way to coding, SEO, content and social.