They have bigger concerns at this point in the game
then eBook piracy which they leave up to the digital sellers like Amazon, Barnes and Noble, Kobo and others.
If a $ 15 hardback is offered as a $ 8 paperback while offered at a $ 6 or less DRM - free
ebook (and downloadable in multiple formats at that, as is done at http://www.Baen.com)
then there would not be so much the of the
piracy issue for everyone to worry about.