If genuine talent generated revenue, fake and imposed consuming needs en masse driving to debt would be an unnecessary practice – Advertising is the only sector of Industry where genuine talent is nowadays of any use.
"If genuine talent generated revenue..."
In some ways, it does, but only in some ways. There are lots of different types of 'talent'. One of those is the talent to write entertainingly. Another is to write coherently. Another to develop stories (note the plural) that work together to create a huge overreaching storyline for a series of books. Still another is to be a 'personality' and so be great advertisement for your own works. HP's author, Rowling, started as a 'faceless' author, in that both she and the publisher were afraid to put forth the fact that she was a SHE when '...Sorcerer's Stone' was published. However, now she is very well known to be a female author, and has become wonderful advertising for her novels, which only helps the publisher (and, by helping the publisher, helping the author).
Now, entertaining writing helps to sell novels for some readers, while other readers look for coherency or for overreaching coherency. Some readers won't read a new author until they've put out several novels. Still others will only read the 'popular' styles, the 'current' fads. There is a lot to look at when speaking of what drives book sales. Movies can and usually will drive the sales of novels, but generally it's only when the novel was put out before the film, and the novel isn't 'based upon the script'.
As far as advertising being the only place where talent is of use, well, I'd have to disagree. Why? See the above paragraphs.
Generally, talent will help to sell a novel, but only after some consumers have read that novel and seen just how good it is. That causes the 'word of mouth' advertising to work its magic, which is how that sort of magic works. Consumers, if they have read/seen/heard/used something that they loved or hated, they will feel the need to tell someone about it, and that communication is the most effective type used. Thus, talent can and often will drive sales if that talent was used in a way that creates an entertaining read for the particular reader.
Now, as a side note, libraries and used book stores can and will help to sell books for authors (that will help the authors to make money) if the consumers there are willing to... 1) Use the used books/library books to check out new authors and such. 2) Use the used book store/library as a way to 'wet the tongue' with an author's work without ONLY using the used book store as the place to purchase books or the library as the only place to get books from.