Answer: Influence The Reader
When the people seeing the ad read it, it makes them feel like they need to keep reading. The creators of the ad want the reader to become interested and continue reading, which they hope will lead to purchasers and buyers.
There are two people holding on to the edge of a cliff. One is your mother, one is your grandfather. The cliff is weak under the three of you so you only have time to save one person. Who would you save? I would try to figure out who is more at risk, and I would consider the condition of both my mother and my grandfather. In the end I would either try to save both and risk the death of all three of us, or save my mother who is young and healthy.
Copy and paste, hope this helps! <3
