What do people, especially Christians accomplish by disproving that we went to the moon? IMO, the most compelling case for the moon landings isn't any one piece of actual evidence, but rather the fact that the Soviets didn't dispute it. We were ready to nuke each other back into the Stone Age, and even they admitted we got there first.
Number two piece of evidence is why bother faking it? It may sound trite but the main cost and obstacle to a moon landing - namely the massive rocket - still needed to be built and launched. If you say you went to the moon, the first thing people would ask is "how did you get there?", and the only credible answer is "in that massive rocket you watched being launched a few weeks back."
This means that if anything it would be more expensive challenging to fake it than actually go there. Hiring a soundstage, building the sets, swearing the whole crew to secrecy, faking the soil samples and moon rocks they brought back to a degree that subsequent generations of scientists would be fooled by them, developing Teflon and the other myriad spin off inventions of the Apollo program, all in addition to building and launching the massive rocket, would quickly add up.