This is the power of advertising, of creating a brand image and a loyal base of dedicated consumer-fans. If a critical mass is reached it even takes on a life of its own and consumers themselves become more effective advertisers than the sellers of the products. A culture of group think and peer pressure is created where identity and consumption are intimately linked.
I know there have been comments before here defending the practice of advertising, even arguing that it is necessary and indispensable, but personally if it was up to me i would have our future socialist states ban all advertising as it is a dangerous and socially unhealthy form psychological manipulation. There are instances in which it creates literal cult-like behavior.