Advertising is in many ways the cultural vernacular of this age. We live our lives through brands and their associated imagery, we use ad taglines as everyday speech emphasis, we even celebrate the cult of creativity that goes into simply selling a product.
It's all psychology. It's the interpretation of our surroundings in a consumer world, the way that want and need is so readily and steadily confused. Go find the surveys that show how many commercials a kid sees before setting foot in a classroom. This is, in many ways and seemingly more so every day, the state of modern society.