It doesn't necessarily mean that your job becomes marketing instead of art, but even just a bit of connecting with your fans can make a huge difference.

And this is more focused on creative fields, because they have been so widely 'disrupted' by technology. I can download a book from a torrent site, but I can't download a programmer's time at working on a problem (though I could of course download OSS code, but that's a whole other thing).

So books used to make a lot of money (for very few people), now they don't make as much money, but the positive thing is that more people can get in on the action, because the costs of distribution are so much lower. And in this author's case, she's basically ranting about how fans of her books aren't paying her, when she could spend that energy much more effectively by somehow connecting with and cultivating that fanbase. If they like her stuff, they'll probably pay her for something, if not a physical book.