Whether or not you are making any reasonable income from it, the moment you start taking othert peoples money you have the responsibility to run your site as a professional. If you just want I hobby then I suggest you run a free directory.
I couldnt agree more, I just wanted to kinda gauge the what why's and how's of the directory world, most if not all seem to be hobbies, even though some take more interest in them than others, thanks for the answers.