Exploiting people who believe

This one goes out to you Harold Camping.  First establish a religious group that is losely affiliated with one of the major religions.  Second convince all the people in said group that the world is going to end in the relatively near future (5-7 years).  Third establish multiple local businesses that would profit from people attempting to warn others of impending doom: radio stations to sell air time, billboards to rent, car detail shops for doomsday custom paint jobs, etc.  Fourth convince all the people in the religious group that they should spend all their money preparing to warn others they will subsequently vacate all of their bank accounts and support all of your businesses.  Wait a year or two after the supposed doomsday has occured and admit you made a grave calculation error and that doomsday is actually 5-7 years later than you initially said, repeat.