That is a good question. I know that some publishers (I think Wiley) do provide the PDF when you buy the book.
I've been following the QUE convention of selling the print version and the e-book version (PDF) separately. So - currently, you would have to buy both to get the the complete PDF along with the text.
I am interested in perspectives on this. Do people want the PDF because it is searchable, or because it is portable?
I have some reasons for not giving the PDF, but I am not sure that any of them are totally valid.
Weak reason #1: In many cases, I don't have rights to the e-book version. So - if you bought Learn Excel and received the PDF and then bought another title and could not get the PDF for free, you might feel ripped off on the 2nd title.
Weak reason #2: As a publisher, I am concerned that it is much easier to pirate the PDF as opposed to a printed book. (I can't quite make that argument with this book, since I am already giving 10,000+ copies away via the weekly e-mails). I don't cruise the file sharing sites, so I don't even know if the complete book is already out there, but I figure that if there are fewer complete PDF files floating around, the better chance that I will not have the book being passed around the file sharing sites.
Weak reason #3: I have to be aware of the fact that 80% of my print run is going to be sold by the bookstore chains. They are a very important partner to me since they move a lot of volume. The bookstores will say it is unfair if I give away the PDF as an incentive for buying from me. So - I would have to come up with some way that you could mail in your bookstore receipt to get a PDF copy of the book.
Sorry for the long answer. I would be interested in hearing your and others opinions on this topic.
Bill Jelen