This is the worst argument and I'm sick of hearing it. Do you seriously, honestly, think that there is nothing left for us to learn on the moon? Or that seeing humans doing things on the moon does not in any way inspire others to push forward in scientific endeavor? Such arguments demonstrate only a lack of curiosity and imagination.
It might sound cynical but it's accurate. There was a big political will to go to the moon because the USSR was beating us at every important space milestone. That galvanized the American government sufficiently to spend massive amounts of capital to win the space race.
After a decade or two, and the loss of any real competition, the US lost the political will to keep pushing boundaries. The primary reason we don't still have the immediate capability to put people onto the moon isn't technical, it's political. We are only now reigniting that desire, and again, it's because of another great power starting to push things in space.
