Here's a thought...

Go and see some gals that aren't advertising 15 and 30 minute rates.

And really give a gal who has a two hour minimum a shot.  I doubt you'll get many replies such as you're complaining about that way!

I have an auto response to take care of this, because if a guy sends me a one liner with no refs, I am not going to pull the screening info. out of him. My website is not exactly cryptic in what I require, and I still get dipshits asking "Are u available?" I will not even bother responding.

I hear what you are saying. All I didn't know was the exact time that I would be available.

I provided all screening information and wrote enough to show that I had read website/reviews.

One would expect a short reply (or even none) if the inquiry were cryptic, shall we say.

Happens on both sides of the coin..

I get these one liner emails "hey,are you available?" sometimes I get one word "Hello" emails.
These type of emails I delete I feel if a gent cannot provide a short introductory email about himself and add his references he is not serious.Even if he just wants to check on a certain day availability there is a way to word it so it is just not a lackluster request.Some are better on emails than others and I know at times people get busy but the short one sentence emails just lack warmth IMO.
You are doing fine