In a perfect world, admin and delivery are nearly 0, the warehouse where it's made is once again as cheap as possible, and the materials and labor will decrease over time as more and more laborers acquire the skills necessary to make the product. This is why drone pilot income is rapidly plumetting, along with database administrators and so on.
Knowing this reality, major corporations and the government have colluded together to "regulate" and "standardize" many industries, as well as creating many burdensome and time consuming processes for all businesses (accounting, HR, compliance).
This admin cruft is the very secret sauce that keeps monopolies and oligopolies alive, while killing innovation and price competition. Essentially, this is the American health care system.
Sales is just part of that cruft. There's a reason I don't need a sales guy to buy a solar panel-- I just need customer support at the most.