There aren't too many countries that can afford to spend a total of $410 billion on a space program.
This is just it, the real answer to "Why has no one gone back?" is to ask the question "Who do you think should have gone there after Apollo?"
There were/are only four countries really capable of that sort of thing.
1) The USA
2) The Soviet Union/Russia
3) China
4) India
1) The USA - Been there, done that, public aren't interested in going back, thus no political will to do so. Nixon canned it as fast as he could and started the Shuttle Programme. Reagan looked into going back, and rejected it as too costly. Bush II started a programme to go back, and Obama has cancelled it.
Result: USA will not be returning until public and political attitudes change and they are once more willing to fund such a programme.
2) The Soviet Union (Now Russia) - Tried and failed. With four attempts to launch their moon rocket, the N-1, failing, the programme was cancelled and disbanded, the funding diverted to the Space Station Programme. With the Collapse of the USSR, Russia does not have the financial resourses to attempt a mission at this point in time.
Result: Russia will not be reattempting a lunar mission for the forseeable future, or at least until their economic issues are sorted out.
3) China - Currently working towards the goal of a moonlanding in about 2025. Have only launched a limited number of manned flights so simply don't have the experience for a lunar mission at this time.
Result: Likely to be the next country to set foot on the moon. They have both the economy to be able to afford to do it, and having the one party system they have the political will to achieve this.
4) India - This is a stated goal, but at the present time it is more a pipedream with them not even having a man-rated rocket capable of sub-orbital flight.
Result - While they want to do it and likely can get the economy and political will to do it, they are far from even reaching manned spaceflight at the present point in time.
5) ESA & Japan - For completion we should look at these two groups as they also have space programmes. The ESA is not looking at Manned spaceflight currently and so have no plans for lunar landings. Japan is in the same position as India.
Result: No other space faring nation (or group of nations) is currently capable of manned flight, let alone a manned lunar mission.
6) Private Companies - The closest company to a lunar flight has currently only achieved sub-orbital flight. Short of space tourism, there appears to be little commercial gain to doing Lunar Landings at this point in time, so for a company, the return for such a venture simply isn't there. On top of that, few if any companies could afford to fund such an effort by themselves.
Result: No profit in it means little likelihood of private flights to the moon in the forseeable future.
(Note here: Should He3 become a vaiable fuel source in the future, this may change, though most analysts believe that the high cost of recovering it would limit its vaiablity as a fuel in the first place.)
Conclusion: Why has no one else gone to the moon? Because there is no one in a position to do so.
But I was really wanting to know why nobody has been there since. BTW, yes I do believe WWII did happen
The formula goes: "I always believed in the Moon landings, until I saw [ Fox TV special | YouTube video | conspiracy web site ], and was troubled by the question of..." This provides the committed hoax believer a thin veneer of impartiality, of having come to his belief by a careful examination of the record.
