I know exactly what you mean! I'm on there and get the same sort of thing all the time.
If I state clearly on my profile "Iam only available on xday, and xday every week" or "Thursday is my day off" I STILL get emails and calls asking if i will do an exception for them!!!!
Also, I have it written clearly "I do not answer withheld numbers, please call back from a non-withheld number" in 2 places, and i STILL get loads of withheld calls all day!
It drives me crazy - it's not a dating site, it's a business I'm running (or at least that's the way i try to see it as or i get lazy!lol)

The only thing I could suggest is you put your phone number up and tell potential clients to call for an appointment (not text). I find that the ones who actually call are usually genuine.

Or only reply to a couple of emails from the one person before asking them directly - "When is it you would like an appointment? Which day/time? x" This usually spurs them into action!

I dont think it makes a whole lot of difference what instructions you write, I'm convinced that when guys go to my site they look at my tits, my name and my phone number all in that order!

I get hardly any emails and i dont mind that, id rather get phone calls as i find it easier to work out timewasters when i speak with them.  I havent found a magic formula to make them read my website and stop the obvious questions so i just go along with it.  What i wont do is go in to graphic detail about what i look like, services, what i will wear etc because I'm not offering a free sex line.  I try and keep it friendly and a bit flirty, answer any questions as best i can, refer them back to my website if necessary and hope for the best.

When i do get emails i try to reply to all of them even if it is just to say that they need to phone me to confirm a booking but i dont get involved in email tennis as its just a waste of my time.  

I also think some times i should cut some guys some slack.  When they call you can sometimes hear in their voices that they are just dead nervous so the questioning isnt because they havent read the site but more to do with babbling on till they have the guts to finalise the deal.  

No offence to any guys reading but lots of men need coaxing through everyday life... this is no different.  Coax them through the call then encourage them to finalise the deal, its all you can do really.

The best calls imo and the ones that always come good are the guys who have done this plenty of times before, know what they want and when they want it and get on with it.  the call usually only lasts a minute or so, no messing about, just get on with it.  I trust those guys much more than the rest.

I wouldnt give up just yet if i were you, AW can be frustrating but the timewasters die down a bit once you have been around there a few weeks and the 'new girl' status wears off a bit.  

I'm still not a massive fan of AW.  I must be the only person on there that gets no business from it, well not much anyway, but its free so it doesnt hurt to stay on it.

Good luck.
xx