What I have heard the computer security industry talk about is amazon does collect some of this information when you check out of the electronic store, they will note which book you buy and increment a counter in the server that counts that book. They use this data to indicate how much they owe an author for their share of the book sales. The server notifies another server that actually writes the check and debits one of the companies bank accounts then mails the check.
There are some amazon servers that will count sales for some lesser known books to see if the company can remove the book from the store to save online space.
However, I have not heard about anyone talking about the sort of snooping that you are talking about.