<As for owning a piece of the lunar rock, when I get there I’ll claim squatter’s rights

Hmm, Dan, nowadays moonrocks or Mars rocks have a great value, but that's just nowadays.
Strangely, more Mars meteorites are found on Earth than Moon meteorites, inspite of the much bigger distance.
Anyway, I remember going to a star party in 1985 near Cypress Gardens in Florida (right after the launch of STS61A-Spacelab D1 with Ockels on board) and some of the attendees were selling small meteorites. Well, frankly, I wasn't really interested. After having touched a moonrock brought back from an Apollo expedition (at the NASM) or having touched a really big meteorite at the Natural History Museum at Washington DC too, I lost the need to get one for home.
Scientists want them for scientific reasons but most of all the others want them for speculative reasons, just like buying a Van Gogh.
And once there are tons coming back, well...no interest
Raoul