What's worse, the framing is absurd. What will they make when they return? Something quite similar to what they made when they left! An artist's practice is something built over years, not some kind of instantaneous response to a single experience. Perhaps it will affect the trajectory of their careers – probably unpredictably for having been associated with this bizarre, self-aggrandizing project – and perhaps it won't. To prescribe this outcome in advance of even seeing what happens is boring and totally closes the possibility of unexpected and interesting outcomes.
I think going to the moon for entirely impractical reasons is itself a conceptually beautiful act, but it's too bad it's been spoiled in this way. The story is thus: "rich man pays for himself and a handful of famous people to be flown around the moon and back." Cool story.
To me, the most interesting part of this is the incredible risk that all of these people who presumably have much to lose will take together. The true climax will be when they return safely, or not.