I know when I preordered the DC Universe book for DC Comic in Mutants & Masterminds, the big "preorder bonus" was the pdf of it, downloaded right then, so I actually had it over a month early. I also have a friend who got the pdfs for Marvel Heroic stuff that I'm not even sure I ever saw as a book, before that line fell, but he won't share them, out of a fear someone will find out, assuming anyone else is even paying attention; I don't harass him, he did pay money for them, after all. Still, in a world where Napster died because Metallica wasn't making even more money, and any video on YouTube that might reference a song, movie, or whatever might get pulled the next day, while GW waves the banhammer over people making the minis they refuse to fabricate, it's no big surprise that this line doesn't have pdfs. Some people will buy them, certainly, but some of those will make them "available to their friends" (haven't we all had a time at the table when another copy of that book would be useful, or someone in your group asked to borrow the book, for the weekend, so they can plan some stuff?), and then they get out to everyone, "free of charge."
On the Deathwatch forum, we talked about if other 40K stuff is dead, while FFG focuses wholly on Star Wars, and someone mentioned that Rogue Trader, possibly the best game there for actual role-playing, and feeling silly-powerful, actually sold the worst of the lines. If it wasn't a contributor to poor sales, then pdfs running rampant on the Internet would have only made them even worse, especially with the book's regular price tags. I know people who can fill gigabytes of storage with pdfs of D&D 3.0/3.5, Pathfinder, and various other lines of things, none of which they ever bought, and while it's nice to know that they can look up ANYTHING, it pains me to know that it hurt the lines in question, who greedily seized my money, but who needed it to keep making my fix.