...with filesharing has [link|http://www.baen.com/library/palaver6.htm|been good].
Considering that on my short list of books that I have bought but not yet read there is one that I read a good chunk of for free before I bought it, I can see how their point works. And adding one more anecdote, after I learned more about Harlan Ellison's opinions on copyright I decided not to buy anything more by him. So not only does he not have anecdotes of gained sales, but he also has one of lost sales.
Cheers,
Ben