Conspiracy Theories - a profitable industry?

There is no question that during impactful, controversial events in history (such as the JFK assassination or the 9/11 attacks) some people will believe some sort of radical theory to explain the event. However, there are also those that realize how lucrative these ideas can end up being. As shown through the Protocols of Zion, a book based on a conspiracy theory can be sold out even if it was written over a century ago. Realizing this, certain organizations simply sell these books whether they believe the conspiracy themselves or not, as they are aware of the money that they can possibly obtain. Essentially conspiracies are compelling ideas and stories; while some might not seem very realistic, it doesn't change their popularity. People are constantly looking for new, exciting new topics and especially if a conspiracy theory is based on a person's virtues then it becomes likely that they are willing to buy a product that describes the theory in greater detail. Within the last century media has also now become highly widespread in which these ideas can also be spread through television and radio broadcasts, constantly attracting a larger audience. Through podcasts, books and even merchandise many conspirators have produced an affluent industry based on these radical ideas, whether it is about the global conquering by the Jews or if Tupac is still alive living on a private island.