Depends what area you are in. Unfortunately in this climate it's like tossing a coin whether you will be busy or not.
If you can afford it then I would try it. Are you being featured, on the local search, showing as available today? They all make a difference when trying to get clients to notice you on aw. Maybe you are in one of the areas that aw doesn't work?
I have had days where I have had no booking and ended up really busy and other times when it really has been dead despite having loads of previous enquiries.
Sorry there are no easy answers.