Actually, considering the value of the rocks, I'm pretty sure everyone is finding it terribly inconvenient.
Furthermore, this article actually has nothing to do with any conspiracy. It is an article about how a Dutch museum mistakenly displayed a piece of petrified wood thinking it was a moon rock.
The article goes on to further explore the current state of bonafide moon rocks, and finds out that NASA never kept track of the rocks they handed out. I'm not sure where Wardogg got the figure 90% from (as it doesn't feature in the article), but regardless it is misleading as the vast majority of moon rocks (295 kg) were kept by NASA and loaned to scientists or museums periodically. It mentions the high value of black market moon rocks and states that, given the nature of the black market, the authenticity of such moon rocks should be called into question.
and not to put too finer point on it, but if I was in charge of a conspiracy to fool the world into thinking that we've been to the moon when we haven't, the last thing I would do is hand out hundreds of samples of fake moon rocks to other countries and not keep track of them.