For me it isnt price, if i want a book i will buy it, but those pesky geographical restrictions are enough to drive me to piracy.
I have been after a copy of a novel called Pope Joan, i can go into the local bookstore and buy a paper copy, but i went to amazon to buy the ebook, and was greeted by the message
Not Available to Australia 
I went to the authors page and left a message there asking about geo restrictions but they don't even reply, i honestly think that geo restrictions is a big reason why we look for other methods of obtaining a book.