I'm not sure how you are wording your emails, so i'm not judging you personally. But in general, if someone is very direct in what they are looking for and sounds serious about booking AND provides the requested info for the lady to agree to booking - they generally will have much better luck.
What frustrates a lot of indy's is when as guy sends out a generic carbon copy email to half a dozen of us and expects that we'll all be jumping to reply. I receive a lot of generic emails that make me wonder if the person emailing is a real person at all or if it's a fake booking, or someone who is serious but was too vague so i'm wary.
Don't send something like:
Bob Noone <justlooking17689@gmail.com>
"Hey
I have some questions. What are your rates? Your pics look hot but are they real pics? What's your menu? Are you free now?"
Versus:
Bob Jenkins <bob.jenkins1967@gmail.com>
"Hello (provider name),
I'm a 45 year old engineer who's visiting Toronto. I saw your add on (ad website). I'm looking for a GFE (or PSE, or fetish, or whatever) type of session for 1 hour incall on Tuesday. My username is bobsleigh18910 and I recently saw Anna Taylor
www.AnnaTaylorGfe.com who can provide a reference for me. I'm wondering what time's you have available? Looking forward to hearing from you.
Bob"
While we love to receive more information about yourself and what you're looking for, a basic email with the essentials is already a step above a lot of the inquiries we get. Even just the fact of putting OUR name in the email as opposed to just "hi" and no name, makes it look like a personal email and not a generic one you're sending to 10 t 6 girls. Also not asking questions that are already mentioned on our website (especially rates, unless a lady doesn't have them listed for what you're looking for). Reading her website will give you a lot of the information you want to know and hopefully stop you from asking something already covered, or that she has mentioned is not available.