Everyone is different but here is my take on pre meeting conversations.  
Once you are screened and a date is committed then I am happy to entertain a couple of emails to get to know you a little before the date. Mostly I want you to tell me any special requests, role play scenarios, or clothing requests. A little personal history is always nice. I would not entertain "get to know you" emails before a date is set. There is enough information about me available on my site and reviews for you to make your decision.  
My replies are not long drawn out letters. Yes, I am busy, but that is not the only reason to hold back. I have found that if I allow you to become a penpal first then most likely you are going to cancel. There are so many time wasters that just want to exchange letters. We have plenty of time to get to know each other during our date. Let's save some mystery until then. Part of my process on deciding how much time to invest in you before the date also has to do with how active of a hobbyist you are. I see you have 3 reviews under your belt. One per year at that. Unless you came to me with a bunch of credible current references I probably would not want to invest a significant amount of time exchanging emails. For all I know you are a window shopper.  
All that being said most of the time we are answering emails from our phone and you are not going to get much love when I have to deal with that little keyboard. I don't think this has any reflection on the actual encounter. I am sure that there are more than a few guys out there that can attest to the fact that they didn't get all the attention they desired before the date but I certainly made up for it when we actually met.
Kisses
Heather

That initial connection is very important to me

as a huge indicator of the type of time I will have with her.

When I ask a provider if she will see me, the ones that respond with an exuberant "Yes!!" followed by a line or two of genuine interest or questions will always get my business before a one or two word forced response. It's sales, after all. I don't expect a pen-pal type of continual exchange, but that first email reply speaks volumes, even if subsequent emails are shorter (in prep for our visit together).

I'm with you mate!

A while back I posted on how I, a very rare hobbyist, had narrowed my choice of a thrice-in-a-lifetime experience in Vegas to two women.  Many asked how I could eliminate so many and narrow it down. Your topic was a big part of it. There were several providers who chose not to respond to my initial email asking some very GENERAL questions without first me filling out their online form. So bingo, they were eliminated. A few were nice enough to answer my questions and two were particularly nice about it and seemed enthusiastic about my wanting role play, request for specific dress and a few other things. So that is how I found my perfect one.    

To me. what separates seeing a well reviewed provider and getting a street walker is class and getting what you really want, which is a lot more and different than slam bam thank you ma'am, which holds no interest for me. (as well as safer and the relatively safe assumption you are not contributing to human trafficking, a heinous crime against humanity)  And since this is so rare for me, I am not chancing the provider, even a well-reviewed one, will scratch my particular itch so questions must be answered first.  

All that being said, I understand why some providers want the form filled out first. But that absolutely would not work for me as I was not interested in having my name and place of employment sent out to 10-13 different providers as I shopped.  

I think Heather's answer also was a good one.  

 
   
 Thanks in advance.

My experience makes me believe that Heather is dead-on here.  In three years of hobbying, I have given three 10,10 ratings, and all three were lousy to substandard at the pre-meeting convo.  One was a "yes-no lady", one wrote a single really nice paragraph pre-screening and then turned me over to her assistant until I knocked on her hotel room door, and the third was a WONDERFUL BCD experience that I nearly gave up on because of pre-meeting communication.  

Two of my really poor hobby experiences were with women with great sales skills -- good pre-meet communications and not good BCD experiences.  So you simply can't tell.

The vast majority of my dates, however, can't be easily categorized.  Some good communication and good dates, and vice-versa and all combinations.  I would encourage you to not put too much stock in this.  Heather was right -- most of the women I have met are busy with providing and running real lives.  They can't afford the time to be pen pals.  Read reviews for specifics that you are interested in, and check the quality of the reviewers.

Remember that backchannel is your friend.  Drop quick notes to the last 5 reviewers of the gals you want to meet, explaining what your are looking for and see what the other guys say.  I've only been messed up one time when I backchanneled, and I blame that one on myself.

Good luck in Vegas -- great variety to choose from.

Of course they are valid.

That being said - you just have to take opinions and ways of why things may be done by others input here and see how of can relate to it.

Some of us go to school, some of us have families, some of us are very active in other interests and some of us do nothing outside of escort.

I try to set aside an hour a day to reply to emails. I put them in a certain order.. Ones where a date is coming up get priority. Then ones of interest. Then ones of, "when are you coming to." Then "Hey, what's up?"

If I have time to reply to all of them, I will.  

Some days I am more eager to send emails. Some days I am more itching to relax by the pool.

What I wouldn't do is think so hard about it. No one knows what the reasons are. Even if you asked the provider in question.. Who knows if it's the truth. Just so long as you are happy with your decision - go from there.

I love to travel and I always do research prior. One time I was going to what I thought would be the best beach vacation ever. It rained 3 out of 4 days. Oh well, I just spray tanned when I got home. Lol. I don't hate that beach or Mother Nature.. Sometimes life just is what it is. Overthinking can kill a good time.

Just how many emails providers get it might boggle your mind. Over the years I've gotten to know some providers and the stories I've heard about not only the amount of emails but the b/s that guys demand  is simply amazing. I for one keep the pre date emails to a minimum.