Electronic signatures on ebooks are just one of the issues they present for both readers and authors. Consider the introduction of “virtual book-signings” where readers don’t even meet the author face-to-face, the interaction is entirely virtual for both parties. At least with a traditional book and book-signing you know the author is there and the work-product (ie, the book) won’t vanish with a computer crash, power failure or corporate sale/merger.
That being said, some authors, especially in the realm of comic books might take the personalization concept a bit too far. Stephen King’s (and Scott Synder’s) autograph on a first edition of American Vampire is one thing. The idea of a comic book containing blood or cremains (ashes) is something else again. Horror is all well and good but there isn’t there a limit to how grisly we get not to mention the potential biohazard risks?