in this room you can put something for sale, or buy something. you can advertise services and seek out services. this is just a place to advertise, due business and discuss details in pm or anywhere else.
examples:
bob: i'm selling a home tattoo kit for $150, please contact me via pm or meet me at bar in the goblin's territory
jane: Offerering a full massage service with a happy ending, for $500. Please inquire in pm or the brothel.