I am in the process of finishing up 150 ebooks that were requested by readers as part of my virtual ebook blog tour last month. I opted not to use kindlegraph. Instead, when people signed up for my newsletter, they specified what version they needed. I handwrote 150 notes, one for each reader, and each a little different, and scanned them into the computer. Then I cropped them, and added an HTML file to my ebook called Signing. Put the jpg in, saved the file (.mobi for kindle, which takes a fresh compile, a LONG time on my little netbook with Jutoh) or used Sigil (free software) to edit the epub.

Those readers who received the first 50 are the ones who took it personal when I went free at the end of last month to tell everyone. And they talk to me on Facebook and light a fire under me to get that next book done. So yes, I think done correctly, such as part of a blog tour or something, signed ebooks are very unique, but they do take time.