As the person who originally suggested it I will say that the intention was to have a place where those who had an exchange they could not use could discretely let others know. Last Minutre rentals being too public. The idea being that as a members' only area honor among TUGgers would be important.
Carol C suggested a Sightings Board at the same time, a place where TUGgers could tell other TUGgers about especially nice weeks they saw available during searches. Again, the honor among TUGgers and sharing amongst ourselves concept being important in that also.
So when the board opened the two ideas were combined.
Email me if you need more.