Conspiracy is a real word, but it can often be applied to the phony make believe that gets pieced together by conspiracy theorists. They take a few loose facts, and tie them together to create an alternate reality. Kind of like what you are doing when you describe "any highly secret, undocumented, and well secured regular meeting of high powered people." If you are talking about the CFR, you have created a situation that doesn't exist. Then you ask if it is more believable for them to be engaging in your fantasy or making fishsticks. Since neither are true, it doesn't really matter which is more believable. If you believe either, you are still wrong.
You believe what you like. If I'm wrong, the world goes on unmolested. If you're wrong, we're screwed. I'd rather have cynical assumptions and be prepared instead of gullible assumptions and be unpleasantly surprised.
I'd much rather be wrong my way than yours.