I do not think it will make the email challenged do a better job. However, the discount might put you in a price range that gives an incentive to those who believe they can give you what you need in 3 emails or less. As someone who typically books in less than 3 emails, if you were $100 above my max and offerred this incentive, and you're someone I want to book, I'm all over it. This can be great if you want, but don't need, more clients and prefer to not get the jokers.

 
However, you will get some knuckleheads who want the discount even though they can't follow directions. They may even try to blame you. It's actually a pretty clever way to weed these ones out too. If they're jerks about it, you don't need them anyway.

While I agree that the booking needs to be taken care of in the least possible amount of emails, I feel like the tone of the message the provider is putting out is somewhat abrupt, but I can only assume she is busy, with little time to spare for conversation.  

 
Personally I often exchange a few emails with my clients pre-session to get to know them. Typically this is done once a booking has been agreed upon but sometimes it is part of my screening process.  As I am doing this strictly part-time and am seeing limited clients I have a different style than I would if I was a higher volume provider.  

 
I think what we can all agree on is that no one appreciates the time wasters who play at booking and simply waste a providers time.

Would probably be less of a headache than them now dealing with emails from those inquiring about the challenge and then probably failing to book an appointment in 3 emails 😄

I appreciate providers that are on the ball and get down to business. I've seen a bunch of providers that have offered similar incentives. For example they would give a small discount if you mentioned a specific word from their ad in your e-mail or if you followed a typical booking procedure. It usually signals you are exactly the kind of provider I like to see.

I'm seeing for the first time, I can usually provide everything they will need in my first and only email or text message, i.e., personal info, date and time of session, and references.  Only if they have a question do I need to respond a second time with anything other than, "We're Confirmed, see you then."

Is this for a one hour appointment or an extended date?

i would think logistics for the latter would require more than three emails.

Or are we talking pointless emails like “i can’t wait until i feel your tight p**** milking my d***”

I would be interested in knowing if it works.  The problem I see is that a-holes are a-holes and will always start out with "U avail now?" "Hi, I'm Dick.  Can I see you?"  "I'd like to see you Wedesnesday at 9, okay?"  "Do you...[fill in ..]

My first reaction is to keep your prices “as is”, but introduce a surcharge for those who are requiring more than 3 emails.  This is along with the idea that they are paying for your time and the more emails involved, the more of your time is required.