The best ads ask no one to buy. That is useless. Often they do not quote a price.
They do not say that dealers handle the product. The ads are based entirely on service.
They offer wanted information. They site advantages to users. Perhaps they offer a sample, or to buy the first package, or to send something on approval, so the customer may prove the claims without any cost or risks. Some of these ads seem altruistic. But they are based on the knowledge of human nature. The writers know how people are led to buy. Here again is salesmanship. The good salesman does not merely cry a name. He doesn’t say, “Buy my article.” He pictures the customers side of his service until the natural result is to buy.