This email just made my day:

I'll be totally honest with you. I'm from Argentina, and here u$s 79 are like u$s 237 for you. It's a great country, but our currency was devaluated a few years ago, and buying things which are priced in american dollars is not easy at all. On the other side, if something is really worth, you may do the effort to afford it anyway.

So I'm the kind of person who likes to try before buying. I know you have a guarantee policy, but I would not feel comfortable asking for a refund anyway. So -even if it's wrong from your point of view- I've downloaded your book from a P2P network (EMule) and printed it.

After the page number 10, I knew it was worth buying it. So now I'm on the page 80 and five minutes ago I sent you the money (bought the book from your page).

The only reason for this mail, is to tell you that your work is so great, that I'm still flabergasted. I really really really thank you for doing such an incredible job, and you deserve the best. I'm glad (even if it's a lot of money in Argentina) to "cooperate" buying your book, supporting your work and letting you continue to make great stuff like this one.