The best tool to determine whether a pain is monetizable (i.e., worth your time to pursue) and to help write your Big Idea Hypothesis is the Big Idea Canvas. The Big Idea Canvas was created to help entrepreneurs like you think through critical questions such as "Who is the customer?" "Is there a monetizable pain?" "What is the market potential?" "How should I position for market entry?" The output of the Big Idea Canvas is the Big Idea Hypothesis. Once you have your Big Idea Hypothesis in hand, you can start talking to potential customers to validate your idea. You can either download the canvas below or go to http://bic.technium.com/ for the automated online version.
For more information regarding the Big Idea Canvas, visit http://www.bigideacanvas.com.