Well, guys. I think, if even money play a significant role for the conspiracy, nevertheless they have all the money in world, so they don't care about how much things cost.
I clarify, first or second or third builded shuttle would be very expensive because of innovtion and venture costs, but mass production of it for sure lowers the price to the net cost of the materials, even if prices are higher in the papers and so on. But again, basically to product even the real shuttle which can take off and land is not really high if it is a mass production conveyor.
But agian, what is money if there is a real game and joy for the conspiracy. What would you do if you have unlimited money from the very childhood!?
You can use drugs, you can be fan of health, you can be fan of women, or doing sports or you can be tired of life unless you create something just great as the Round Earth plan for the conpiracy members. By the way, they have interest in discovering.
And also, I think, by the year 2050 the world would be in general informed of the fact that old science was wrong and there were really bad rulers who fooled humankind. World is not going to be cruel with the time. At least I believe in that)