Why have NASA never return to the moon?

While some believe that NASA's moon landing was faked. There are others that believe that they did make the moon landing. But someone was already there. NASA so far have refused to answer the question, why have NASA never returned to the moon?

[center][youtube]http://www.youtube.com/watch?v=uGVWXq_xSoo[/youtube][/center]

[center][youtube]http://www.youtube.com/watch?v=gtdOQSOQ6hU[/youtube][/center]

[center][youtube]http://www.youtube.com/watch?v=sUcKXWe0VYk[/youtube][/center]