When I log out of the board, the Post Reply button appears, but when I click on Post Reply and attempt to log in, I get a "You cannot reply in this forum."
Do you mean to say "The ‘Post Reply’ buttons at the top and bottom of your add are just for others replying to your ad."? If so, that doesn’t seem to be the case for all the ads on the Webvertize, since I’ve seen other ads where the original poster has replied more than once.
The ‘Post Reply’ buttons at the top and bottom of your add are just for replying to your add. The way the system works, the only way to contact a replier is to click on their name or the contact button on the right hand side and send them a PM unless they have posted their contact info. This holds true for all sections on these boards.