From the ISO forum description:
"This forum is the place to ask for hobbying inquiries. You may ask about where to find certain girls, particular activites, or for information on certain types of ladies. General inquiries and the like. Consider this a specialized forum for feedback and suggestions. Other general discussions belong in the Coed Discussion areas or Men's Lounge. These are not hard and fast rules - just general guidelines."
Is the ISO forum a place for providers to post looking for Johns? I would think it could quickly become a predominantly advertising-based forum if so.
Of course, there's a discrete way to do it, such as, "I found myself in Ashtabula, whatever is a girl to do?" Or a lady can just demand to use the forum for the same purpose as the guys, except it isn't; one is shopping, the other marketing.