Do you have a niche market? When you want to sell a product you want to make your sales pitch as effective as possible. You don’t try to sell food to people who are full all the time, because your efforts are wasted. You would have to spend a great deal of time trying to convince them to buy it. If however you were approaching a bunch of people who were starving then you would appeal to their appetite, their benefits from eating (energy, no more growling tummies and so on). You could target ads for them and they would most likely need what you have. The other group may purchase too but only if they need it. You waste no time this way.