Bloody hell UA, I think you need a hobby. They are asking you your rates because they are too lazy too read your profile properly - I get calls every day from men who start by saying 'I'm looking at your website and...' and within a minute they have asked where I am, how old I am, what my rates are and so on. So does every other escort in the country, I would think.
It's not a conspiracy and it's not just you. They are also probably trying to talk you down a bit - if they start a conversation about how much a particular booking would be (a long one for example, or one at very short notice), it's usually because they're trying to get a discount on the published fee.