Re: Let's see! NASA has over 400 kg of lunar material...
Those arguments have been mentioned over the years. Even by astronauts (I think Aldrin talked about it).
However, NASA cannot do this because it isn't its role. It cannot make money out of selling those rocks.
One reason why they haven't examined all the rocks is that they're waiting for improved technology to analyze them. For instance, if one wants to examine what's inside a rock, it will have to be cut. However, cutting a rock will inevitably affect other experiments.
Raoul