I agree with you in concept that most of how Marketing is done, is in fact Bullshit. But you have a website, you write books, you have business cards, you make appearances, etc....these are all forms of marketing.
The funny thing is, I have business cards but I almost always forget to have them with me. It gives me the creeps to pass them out! And, in fact, I decline most "appearances," and our web site is not exactly slick. Mostly, I answer people's questions, here and whenever writers call me ... luckily they call on a regular basis.
I do write books, but that's because I like to write and I want to put my ideas out there. I guess most people see that as marketing, but I would be doing it even if I wasn't designing courses for a living.
The author's full list of things not discovered through advertising and marketing, but via word of mouth: cheeses, wine, meats, eggs, tomatoes, basil leaves, apples, restaurants, barbers, art, books, hotels, shoes, shirts, eyeglasses, pants, olives, olive oil, cities, museums, art, novels, music, painting, sculpture. [He's not a golfer.]