It's more profitable for the company to hire a freelancer or franchise SEO. SEO promotion involves different work: technical optimization, writing articles and finalizing sections by a designer and programmer. All this work isn't done by one SEO specialist. An Internet marketer isn't a person who writes texts, dresses up the design and programming, and understands SEO and marketing simultaneously. Of course, some specialists offer a full range of services, but they all, as a rule, do it equally badly. Technology is constantly changing, skin each area. You need to constantly allocate a lot of time to learn, develop, and gain practical experience.