Heh... I'm not going to bother to debate the mechanics of a Conspiracy, because you won't be convinced no matter what I say. Although it does make sense that the NASA execs would believe that the Earth is round, it is impossible for them not to have realized it was flat if it was so. Think... it would be much more expensive to build a fake infrastructure capable of acting like the satellites and fake all of the data coming from satellites to match with expected data types (99% of satellites are NOT designed by NASA, but by separate research teams. NASA would have to be able to show the research teams the data from the satellites that were suppose to be in orbit, but were not).
Also, NASA's budget is only 17.6B USD. Do you really think that is enough money to propagate all of the lies and infrastructure necessary to mitigate the consequences of faking the space program? To me, it is absolutely nowhere near enough money. It is obvious to me because I am aware of all of the information, data, and research that both goes into and comes out of the space program. It would be impossible to do what you suggest with only 17.6B per year.
But that's it for the Conspiracy for me! heh... you'll get me going on it, towards a dead end that neither of us will concede.