I run a forum and was thinking about displaying banners after the first post only for guests. Do you think its against terms to put "Sign up and this banner goes away" under it? Or do you think I should just put the banner up for guests and say nothing. Thanks in advance.
I think it's a good idea displaying more adverts to guests, I can't see it doing any harm saying sign up and this banner goes.
I would hesitate doing that.. because it is drawing attention to your ads. To be safe I would clear it with google first.