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The problem starts after landing
Every rocket, every lander, every station module is built on Earth and flown to the Moon. The ground it all has to stand on is not. It lies there as it has for billions of years: unsurveyed, uneven, and bombarded at every landing by stirred-up dust and rock that, with no atmosphere, reaches the speed of a bullet.
A lunar base needs a level landing pad and protective walls, plus trenches, foundations and cover against radiation. For a single minimal base, 2,600 to 15,000 tonnes of ground have to be moved before the first module is usable.
One flight of the European lander Argonaut brings 1.5 tonnes of payload to the Moon.
A single minimal base needs 2,600 to 15,000 tonnes of moved ground.
And every kilogram landed costs around 1.2 million dollars.
What a base needs, against what one flight brings
On Earth such tasks are done by construction machines and the people who operate them. On the Moon there is nobody, and shipping a terrestrial machine does not work: every kilogram landed costs around 1.2 million dollars, and a machine that needs its own weight as a tool loses, at a sixth of the gravity, exactly what makes it useful.