Not until the newsstand version of iBooks is launched....
iBooks Author: Publishing and distribution FAQ
http://support.apple.com/kb/HT5071
Can I distribute works created with iBooks Author as part of a product or service that charges a subscription-based fee?
Books created with iBooks Author may not be sold as part of a subscription-based product or service. iBooks Author books must be distributed free of charge or made available for sale via the iBookstore.
(via Instapaper)
Sent from my iPad