If you’re NASA, the cost comes from a cost+ contract with an incompetent vendor. If your Blue Origin, the cost comes from each launch complex being essentially

If you’re NASA, the cost comes from a cost+ contract with an incompetent vendor. If your Blue Origin, the cost comes from each launch complex being essentially bespoke and built on-site. If you’re SpaceX, you plan ahead to use lego construction, mass produce the pieces, the tanks, etc in a factory setting, and assemble the pieces on-site for much less and much faster.