Have you ever experienced that one day you are in a situation when someone asked you for a help but you were busy? Even at the beginning you did not want to help, but because of the person gave you reasons why he or she needed your hand, finally you would help him or her. Human’s brain without any consideration, always finds reasons.
For using it in a marketing world, tell that what you offer is a reason (“because”). As an example, because of your birthday, because of Christmas day, because of end year you will give discounts. And other reasons. Usually, people are happier with our reasons than we offer without any reasons (or you have ever experienced it your self?)
So, please use reasons in your business. Make points of idea then offer your promotion with reasons and then measure the effectiveness.