I've found each provider has her own style, what's important is how she performs in the session; but I know how you feel. I also like the flirty electronic contact before the show, this is a topic I've been struggling with on a personal level. I've had a wild ride in my first year, so excuse me if i go off....it's for my benefit too I guess..
First don't overdo it, they are running a business, they might be responding between clients, or if they're on a long date they might be responding while she or her date is in the bathroom. They get paid by the hour, time your self writing emails, it's a lot longer than you think, to them this is OTC time.
Sometimes it's a trade off, one of my favorites, a great talker in person, but normally responds to email with one or two sentences, but, .....she usually responds within an hour or two. If it's a more than several hours or a day she apologizes. Most of the other providers take a day or two, but they will engage in longer emails.
Make sure you are not looking for a relationship, that is not what they are providing. If you want an emial relationship try Ashley Madison. I joined for a while, I had one, it's was fun, it was drama with no sex, just like coming to Vegas is sex with no drama. Unless of course you make your own, excessive email and OTC contact is the first sign (yep, been there, done that, it sucks).
If you want a provider that is "electronically" chatty, find one on the boards, but understand that if that is your priority, you may not be able to find one that is e-chatty, and have certain hair color, breast size, weight, muscle tone, ethnicity, blah blah blah, that always makes up our fantasy. So don't look for a physical type first and hope you can request a personality from a menu, it doesn't work like that, personalities are not like lingerie.
Maybe you can post an ISO "Visiting in July, I like to meet a provider that will exchange one mail a week until we meet.". You may consider a little gratuity may be in order as well. What the hell, if guys can asks for girls into smoking fetishes, Greek, and daddy fantasies on this board, you should be able to ask for one that likes to share emials before a date.
On serious note, perfect advise!
I can't speak for all of the ladies, but given all the emails I get daily for pre-screening, scheduling, follow ups, rescheduling, references and all other communication combined with "real life" business emails ... my damn blackberry is pretty much surgically attached to my hands.
There are days when I sit down in front of my computer for just few minutes to answer some emails and before I know it the day is almost gone.
It is not unusual for me to respond with "got it, will write more later" not because I don't care, but simply because I may be on extended date, or traveling, or spending time with friends/family.
I would rather send one - two sentence reply right away than wait till I have an opportunity to sit down and write page long answer.
Lina
On a scale of 1 to 10, I would put flirty initial e-mails at about 2 in order of importance. Much more important that they are being answered in a timely manner and your date time is confirmed. You obviously liked something that you saw and if you like the reviews then that's what really matters in my opinion.
I certainly don't think confronting a pro about her e-mails is going to help out any. Keep in mind that some of these ladies get numerous e-mails 24/7 and they have better things to be doing then answering e-mails all day long. 
Besides, sometimes you'll find that the e-mails get a little warmer when it gets closer to date time.
-- Modified on 6/4/2012 3:54:20 PM
I live in San Diego, and our most well-regarded, mind blowing, toe curling sexual dynamo over the last decade, AnnaGFE, never responds to any email with more than a sentence or two. I almost backed out of our first meeting after a couple of curt responses from her for the same reasons you mentioned. Thank god I didn't, because, wow, she friggin rocks! She just doesn't have the time or patience to sit at a computer, typing. If your gal has great reviews, go with it.
My experience, as others have written here, is email or txt communication before or after meeting is NOT AT ALL related to how the provider will conduct themselves in person. However, I understand why having meaningful correspondence with , or prompt response from, your chosen provider might be important to you as part of the experience. If so that's just another requirement you have to manage/compromise on in selecting someone.
I suggest you keep it your concerns about her correspondence to yourself until you get to know her better and in person.
