You're just a business lead and like all businesses, an immediate assessment of the potential opportunity is made. Your cum twice question may suggest to many girls a more difficult client to please; if she's plenty of other leads, these may go above you. The easy money is the easiest!
One thing we punters often forget is, just how many emails these girls get. And with the phone going as well, the popular girls conclude replying to all emails is just not worth it. This is particularly the case if your feedback is low, or the email looks vague. Without casting any aspersions on you, consider your writing style and whether you're coming across as a likely client (do you name a likely punt date), and not a time waster who is sex-texting. Hot leads - likely appointments come first, not casual questions.
That said, some just do not reply, particularly sergei managed ones and those who do not want to give away their bad English, I suspect. Don't take it personally. The professional girls (if you're reading) use their down time (or is that up time) to reply, thinking long term, and keep leads warm for potential dry times.
