You are a moron. How come I never wanted to smoke cigarettes despite being bombarded with tons of ads as a kid and all my friends smoked?
Smoking is a horrible example.
The much better question is why would coke spend billions of dollars on add campaigns.
Do you believe it's because it don't work?
Are you that fucking naive?
But again this is a typical adonis debate, if you completely ignore everything we know about human nature you are correct. However if you factor it in for even a fucking second, your autistic, beliefs seem child like.