The number of conspiracy like theories is exponentialgrowing exponentially.
http://en.wikipedia.org/wiki/List_of_conspiracy_theories
Here are the most famous.
How many of these have achieved any tangible success against the "enemy", bar I guess consciousness raising? Of course, nil.
It seems that if I am to believe that a conspiracy theory is any use, there must be examples of similar theories that ended up as something other than a talking point.