[Fargren]

DISCLAIMER: the following is my personal belief, and I don't have more than a few anecdotes to back it up.

You shouldn't be concerned about copying no matter the format. Almost anyone who gets a copy of your book illegally is someone who would not have read your book at all if he couldn't have gotten it for free. And with these people, you are better of if they do get it; they may share it with someone who will become a customer, or they themselves may become customers in the future, when they learn that they like what you do and/or their purchasing habits change.

[znpy]

Can confirm: I usually "evaluate" books before buying them.

Some books are really worth having on your bookshelf.