I think its a good question.
If your ad campaign strategy is based on a prediction about what "people" will do when they encounter your advertising, I have a question. Which people are we talking about?
Too often we hyper-simplify people into a category of beings akin to robots. We assume they have nothing better to do than count their money while waiting patiently for the appearance of our ads. At that point we expect them to react with mechanical precision and make a purchase. At least that is how people are often thought of in this context.