I think Chris has the permissions set that way. I know Classifieds are different from the other forums, and don't allow replies, etc. I think the way you handled it was good, by replying with a "SOLD" comment. Next time I talk to Chris I'll mention it and maybe we'll change this if people want. I personally would like to have replies be enabled on posts in the classifieds, but it requires a little extra moderating if someone complains about price on there, etc. There might be some history behind this, I can't remember.