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Most people’s reasons to buy can be boiled down to responding either to increase their pleasure or to avoid pain.
Health products are nearly all sold on avoiding current or future pain and if you can remind the prospects of the agony they are going through you’re half way there.
Most promotions could touch on the relief of pain, even money making ones. You might paint the picture of not being able to afford to give your kids the Christmas presents they deserve or your wife that special holiday on your anniversary. Could you bring pain into your copy?