greenleaves - 6:48 pm on Mar 28, 2012 (gmt 0)
Ditto what Bill said.
I take it a step further. Long before pinterest I set up a anti-hot linking script which replaces the image with one that reads something like:
Get Cheap Widgets at MySite.com (for drop ship site)
Warning, BEFORE you Buy Widget, Visit MySite.com (for affiliate review site)
Also, you could watermark them so you get free exposure in exchange for a little bandwidth