Платна ли отправка книг на email name@kindle.com при доступе по Wi-Fi?

Нет, плата взимается только при доступе по 3G:

Send the e-mail to your Kindle e-mail address for wireless delivery directly to your Kindle; If your Kindle has Wi-Fi enabled, it will be delivered to your Kindle at no charge. A small fee will be charged for the wireless delivery over 3G.