I think you're looking at it the wrong way. When I was in production planning we understood that there are value added services and non value added services. So

I think you're looking at it the wrong way. When I was in production planning we understood that there are value added services and non value added services. Some of the services you describe fall into the value added category, like writing and maintaining code. Anything that adds value to a product or service is... value added. Coding is making something better. Paying for outside QA processes would be an example of a non value added process. Doing (arbitrary) documentation (like customs paperwork) is not value added. Creating a user manual for software is value added. But to answer your question, SEO seems like something you're looking for. I'm not sure sales counts, considering it's not really a STEM type job.