The people I know are entrepreneurs that are willing to put in the steps on and off platforms. The intricacies of Steem are nothing in comparison to what it takes to run a business or shop ones talents, skills and wares. I think people who are limiting themselves to online are well, limiting themselves. I do not know any purely online authors who live well off it, but I do know playwrights, poets and authors who use online platforms to enhance their reach. All of them put more than their skill in to get to where they are.