From the Pocketgnome Forums:
Isn't Warden detecting you running the bot?
We have a huge reason to believe that Warden does not exist on Mac OS X. Mac OS X was built to make sure people couldn't make a keylogger and immediately start reading your programs without you knowing. Thats why if you ever get a keylogger blame yourself, you approved of it to read all your stuff by typing in the administrator password. You know when you install a new program or every time you open PG, it asks you to insert your admin password? Its because programs cannot read or open other programs in Mac OS X without the administrative password. Since WoW does not ask for such password when opening, it can not read other programs.