We also run all of our adult sites like that, we have a directory with nothing but our sponsors code links, so if we want to change the text links or banners for all of our sites, all we have to do is make one change within a single directory and all of a sudden all our sponsors stuff is updated. For days when ars pops up to $75 a signup it's nice to be able to change one set of code and send all our traffic that way, and then at the end of the day switch it back
Tim