Totally agree with you on this part. And in addition to having your own website, your own newsletter, too.That just happened with a book, When Harry Became Sally. It's been delisted in Amazon but is still available from the publisher's site. Lesson: every writer should have his/her own website, and should be prepared to, if necessary, rexograph their own books and send them out.
Joking about the rexograph, but the point is: be prepared.