I was at a garage sale and I was perusing a bunch of Wrox books. The seller offered me a ridiculous price and then I noticed he was on the cover of one of them.

I asked him about it and I think he'd rather have the latter benefits than the minuscule compensation:

"Piracy is a double-edged sword. On the one hand, it means you receive no compensation for the benefit readers get from the work you put in. On the other hand, pirated books act as implicit marketing, expanding awareness of you and your book(s)."

So I bought the books, but asked if he had another copy of his own book. He said that he did not, because that he guesses he should keep a copy as, after all, he was the author. That's a lot of trauma for him to say something like that.