@farmerman,
Lost funding, more like . . . there was no on-going justification for more moon missions. The entire space program was inspired by sputnik, which chilled the blood in military veins, being the outward visible sign of Soviet rocket technology. The little "beep, beep, beep" of sputnik kept telling them Pentagon boys, "we can launch transpolar icbms at you." So the space program became a no-brainer, and Kennedy's resolve to put a man on the moon before the end of the decade (which we did) developed a momentum of its own. The "law" of unintended consequences is not entirely devoted to unforeseen disasters, we reaped incredible benefits from the space program, and continuing moon shots might have generated more--but we also were probably on the down slope of the curve of surprising new and lucrative technologies with that program, and we had a big war to pay for. So the moon program faded away with a whimper . . .