What exactly are these imaginary fixed costs that marketers don't have? You mean hiring advertisers is free? You mean buying commercials is free? You mean flying out to conventions is free?
I can tell you of quite a few startups led by MBA marketers who burnt all their cash trying to outsource their technical work. All the money went into hype which they don't even have a product for. Would you rather have imaginary hype or would you rather have a physical product?