Because it was expensive as hell, and politicians of the time felt we had done all that justified the expense... Russia had been beaten, and we grabbed a bunch of rocks.
Our plan to go back in 2019 (dependant on us verifying with 100% certainty that ice water does, in fact, exist on the moon as we're already nearly certain it does) includes establishing a permanent base to act as both a lunar research facility and a way-station for lunar-based launches between the Earth and other destinations, such as Mars.
I have absolutely no problem saying that anyone who thinks we didn't actually go to the moon in the 60's either isn't bothering to do any real research on the matter, or isn't the brightest crayon in the box.... or both.
Start here:
http://en.wikipedia.org/wiki/Lunar_l...ing_experiment
