I agree that we have the tech to do this affordably, but I strenuously disagree with this:
The activities at this moon base would be focusing on science, as is the case in the Antarctic. It could provide an official U.S. government presence on the moon, and its motivation would be rooted in U.S. national policy—again as are the U.S. Antarctic bases.
To the degree that the focus should be on “science,” it should be about better learning how to live on the moon, and Antarctica is a terrible precedent, in that we aren’t allowed to exploit it for its resources. That’s also why the Outer Space Treaty itself, which was modeled on the Antarctic Treaty, is a problem.