I do not fathom the people who have been downvoting my comment. By all means, if you find someone on this site who submits nothing but link spam, downvote and flag them. Otherwise, why get your knickers in a knot about me getting a pittance for recommending a book I happened to like?
After stoping to care for downvotes and upvotes, I started to see my karma as a _wallet_, with it I could _spend_ points in irrelevant comments, bad jokes, etc., but not carelessly, just enough to have a good laugh without compromise or worry. Positive points in my _wallet_ means I'm still contributing positively to this community, just that.
I would never downvote you for it, and I'm not saying you're wrong to put it in, I'm just trying to explain how some of us here will see it.
I'm more likely to check out the link if (a) you have nothing to gain and (b) I've seen great design work you've done. Without that I usually can't be bothered.
An Amazon link doesn't save as much time as it would have in the 90s and the message looks spammier for it.