I thought I'd do a little information gathering regarding my readers. I posted this poll on my facebook and twitter feed and at the time of posting have nearly 300 responses.
20% of my followers/friends bought the hardcover.
33% bought the paperback
27% bought the ebook
8% used the library
5% got a promotional copy (A lot of my followers are bloggers!)
And 5% of the people who've bothered to friend me on facebook or follow me on twitter pirated a copy. That's about the same as the numbers buying the hardcover off Amazon... which ain't good!
I suspect in the wider population that last percentage is considerably higher. However, as a glass half-full kind of chap, I'm heartened that 95% of responders appear to have obtained a copy legally. Additionally 88% of the copies were acquired in a way that went some way toward paying for the effort I put in over several years and for the publishers' investment and time. I was worried the picture was going to more grim, even among people interested enough to see the poll.
I ran a second general poll, linked on reddit r/fantasy and gathered more statistics. This one has 450 responses at time of posting:
29% bought the hardcover.
14% bought the paperback
31% bought the ebook
6% used the library
1% got a promotional copy
And 11% pirated a copy.
I'm suprised that the percentages buying hardcover and paperback vary so much between the surveys.
Sad to see that as many copies are stolen electronically as are purchased in hardcover in bookshops.