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Seriously though, to your point about not ruining the spot, I think its unfortunately inevitable. I can envision Moon casinos a la Niagra Falls ("Our payouts are astronomical!"). Niagra is an extreme example because it was accessible to the public long before the National Parks Service was invented, so there weren't any controls. The Moon would probably be a lot less accessible, but literally speaking, what happens on the Moon, stays on the Moon. Every Armstrong and Aldren footprint is still there, presumably.