Oh, older. In the 1970s and 1980s there were ads in the back of Popular Mechanics and the like that advertised pamphlets that you could send away for from peopl

Oh, older. In the 1970s and 1980s there were ads in the back of Popular Mechanics and the like that advertised pamphlets that you could send away for from people who "made it big" and "wanted to share it with others" but asked for a small fee ($5 or $10, which was more than that is today) to show that you were "serious" about wanting to learn the secrets to become rich.