“Ray Dillinger is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com.”
There. They said I ought to put that text somewhere on my site, and now I have. Anyway, I figured it was worthwhile to provide an Amazon link to a book that actually quoted me and prompted me to start blogging. And having done that, I figured it was worthwhile to get paid if someone happens to want to buy it. So, yes, I joined the affiliate program.