I purchase mostly digital books because I use to read at night next to my sleeping partner and e-reader is the easiest way for me. Also O don’t have a very big house to store all. Now from a piracy vs purchase point of view: I actually buy ebooks as a mark of support to authors I like very much. Now I must confess that for some very popular authors, I trend to think that one book pirated or one book bought won’t change a lot for them. So I buy mostly less known or indie authors at the end.