when a user buys my ibook in iTunes store, how can I find out more about the user, state purchased in, email it downloaded to, etc ?

when a purchaser reads my email message in mailchimp, I am provided with the user details, email address used, state located in, etc.....why can't I get the same information from Apple iTunes when a purchaser downloads a paid copy of my iBook from the Itunes bookstore.????? in order to complete the download of a purchased iBook, that information is gathered by Apple, but is not provided to the iBook author.....any solutions out there...