the moon landing being fake is, for me, perhaps the pinnacle of traditional conspiracy theories.
it has a lot going for it, the US has to beat the USSR. At the time, technological prowess, brinkmanship and displaying the rocket capabilities were so important to the dick swinging contest that was the Cold War that faking it seems plausible in the context of all the other mad shit that went down during that conflict.
however, the lack of hard evidence says it all and, crucially for me, up to 400,000 people are estimated to have worked on the NASA project and for them all to keep schtum for so long? no chance. yes, perhaps only a few were privvy to the actual fake 'landing' but i think the principle stands. The fickleness of human nature will always come through.
For me it's a great conspiracy theory, with an actual genuinely plausible reason to be fake, not just "lizards" or "new world order" backhanded lazy stuff.