There is nothing more evil in modern business than marketers. Between real life experience and MBA classes I have come to despise most everything involved in modern marketing, especially in the technology space.
Give me a break. This isn't evil marketers hiding in their underground lair. This is web developers, designers, and product managers gaining insight about their users. They don't package this information and sell it wholesale to advertisers. They use it to make the product better . You are taking this -way- too seriously. The ability to have perfect information on how users interact with your product is one the earth…
They pump exorbitant amounts of money into advertising, thereby increasing the final price paid by customers without increasing product quality. Furthermore, they use these advertisements to inflate their customers' perceived value of the products, once again, without actually increasing product quality.
Marketers maximize profits, not quality.