All ads are supposed to entice people to buy something. Those who make these ads know people won't just buy a product because they've seen it on a TV or in a newspaper. Implied satisfaction after someone buys what they are selling is what they always try to nail.
All businessmen can use this "trick." It is not manipulation per se but since skeptics need evidence that will convince them to buy something, you have to provide it. Honest, objective reviews (of products or services) and testimonials of people who've bought what you are selling are enough to win them over.