Same as Anika Mae - I do get some good jobs from Adultwork but not masses, the vast majority come through my website although when I have asked clients, a good few got my number by clicking through to my site from my AW profile. I get the most site traffic from Punterlink and Punternet, as well as AW (in that order). I get far more timewasting emails through Adultwork than anywhere else.
Timewasters on the phone are part and parcel unfortunately, although you do get better at spotting them as time goes on! It might sound blindingly obvious to the point of silly, but if you really don't want to answer phone calls have you thought about only taking initial enquiries by email? Just don't put a number on your site - if a client is interested and sends a promising and genuine-sounding email you can always pass on your number in a reply at a later point. I know some ladies do this, particularly those who have other commitments and are not often able to answer their phones during the day.
My phone manner is generally crap, and it is sometimes a real effort to answer the same set of daft questions for the nth time that day, but that comes with the territory - not everyone has the time or the inclination to read every word of a website (the classic 'can I have some details?' is the one that is like nails down a blackboard
). I have the legend 'text messages will not be answered' right underneath my number on every page of my site, and I still get at least three or four a day.
Frankly, as I am getting paid ?130+ per hour, I have learned to live with it.