[ It pays off to be unassuming. ]

Then you would understand, some of the implications.

[ Rachel spreads her hands. ]

The people who know how to use it presumably already do... and if you recall, the rulebook says that the dark room is for all of one's nutritional needs. It would not be too much of a step to assume that one of the people here who have checked in are one of Them. Possibly multiple.