Doomsday: Those Making Money off of the "Rapture"

Historically, there have been plenty of dates set for the end of the world, and, I imagine, there have always been those who have sought to profit financially from it.  I have read of quite a few, including in the days of Roman persecution under the beastly Caesar Nero, right up to the darkest days of 1944 Hitler/Stalin murderous rage.  In more modern times, the 1970's were often cited, as was