If you reply to a members comment(s)/question(s) this does not count against you. However, an AD is not the place to carry out an involved conversation.
Agencies and Assistants are under different regulations and should contact TER with any questions.
I know there's a set amount of ad posts (I don't know the exact amount) we are allowed to add under our OP.
My question: If I reply to someone, who posts on my ad, does that count as one of the total number of posts I'm allowed to post on my weekly TER ad?
Thank you, sweetheart, and do you know of anywhere on TER, the Ad Posting Rules are listed?
The ad posting guidelines are here:
http://www.theeroticreview.com/discussion_boards/viewmsg.asp?boardID=33&Messageid=75544
"Posts regarding contact info, availability, schedule changes, new website announcements, or new pics all count as ad posts. Updates may be added as posts to the original thread during the 7-day period."
Self-replies to an OP let a Provider post more pics or more info. I see it all the time. Agencies start with an OP and then "reply" with a separate reply and pic for each escort available that week.
My question: If I reply to someone, who posts on my ad, does that count as one of the total number of posts I'm allowed to post on my weekly TER ad?
Although the link info doesn't address my question, I do think you and MrFisher are correct, "replies don't count.' 
Thank, love, and have a wonderful evening