They are filled with offers for services, products and information. And they sound good. The ads show enthusiasm about the materials being offered. There are many things you find of special interest constantly. Or perhaps you can tap into wholesale or surplus goods that you can sell at a good profit.
Bargains are always in demand.
Information in the form of how to make or do something is a constant best-seller. People are always looking for simpler, or cheaper, or better ways to improve their crafts. The proven method of selling mail order items of information is called the two-step approach. Basically, you place a short classified ad in the back of a magazine or tabloid. The ad does not mention price, but tells the reader to write for free details.