There always has been and always will be people who respond to that type of ad. Use the desire to gain without much effort to your advantage. Chose a product that solves a problem and gives fast results. This headline does what virtually every woman's magazine does. No one wants to be left in the dark.
Curiosity has to be satisfied.
The above headlines all appeal to emotions and desires all of us have. To be able to influence people, make people like us, improve our memory, make more money with less effort, curiosity, to be in a position of power, etc. All of these headlines stress a benefit you will gain by reading the rest of the ad or sales letter. Tell your prospects what your products will do for them . I'm sure you've gotten letters that talk about a mysterious moneymaking opportunity that won't be revealed until you buy the product.