It doesn't. That's just RightWhale's mistaken interpretation. Smarter people than him, who actually understand space law, know that the OST doesn't ban it, and you're entitled to keep and sell resources that you acquire off planet. All the OST does is not allow declarations of national sovereignty.
The Moon Treaty is more problematic, but the US didn't sign on to it, so we're not bound by it.
Somewhere around a dozen nations (most of them tiny or 3rd World at the time of entry) signed on to the Moon Treaty. There are hundreds of countries on Earth. That says a lot about the Moon Treaty.
Bush may have wanted to withdraw from the OST, but sacrifices were involved:
1) too much of a space focus hurt Jerry Brown in California, winning him the belittling nickname of “Governor Moonbeam”.
2) Withdrawing from the OST could have fueled others’ complaints that Bush was an imperialistic invader who wanted the USA to control everything. The Iraqi coalition was fragile enough as it is.
3) Like companies would do much with the reforms he could have brought about?
On the flip side though, we paid that guy to be a LEADER and we renewed his contract to lead even more. Has he let us down?
That is incorrect and insufficient and that is proven by the absence of development of space mineral resources.