Incorrect.
(1) Value of moon rocks are based on the collectability of their rarity, (only 840 pounds from 6 Apollo moon missions)
(2) Mining them and bringing them back will extremely reduce the rarity, and thus their price.
(3) Captial costs way through the roof for non rare metals????
True folly, and fools at work.
Yes, and no. There are tons of diamonds out there, and their availability is controlled, keeping the market high. There are millions of silver dollars, too, but only a few from 1804.
The supply of moon rocks would be even easier to control, at least initially. Issued by location and type, serially numbered, and series they could be the next collector market, with early issues in shortest supply and highest demand, even in a limited market, provided the quantities were limited too.
The Apollo mission rocks will remain rare, the 'First Return' issue would be the first it was legal for private citizens to own. (The Apollo rocks were presented to countries as a diplomatic perq, to be in museums or to be studied in university labs. You can't legally own one, as things stand.)
Currently, the only way for anyone to own lunar material legally is to have a meteorite composed of lunar material, literally blasted from the moon by impact and which made it to Earth.