Apparently the guy who wrote the Camel book on Perl made less than $1000 from that book. I was shocked when I heard about that because back in the day when I was learning that book was incredibly popular and seemed to be everywhere.
EDIT: Edited, not wrote. My bad. That's a crucial distinction. Also, I meant the Llama book, not the Camel book.
That’s not true. I wrote the Panther book, Advanced Perl Programming, and easily made way more than 100k. Of the 25-30 or so dollars the books cost, I got 10% per copy, or $2 after taxes. The first print run of 35000 sold within the first three weeks.
The Camel book was already a huge bestseller, and was one of the anchor books of the early OReilly series. It made Larry a pretty penny