Posted here before, just like the most pictures that oblivious have been stolen from here and other forums about rare/unreleased games.
I know they're stolen but personally (and obviously I can't speak for anyone who uploads/puts the effort in to take photos of rare products) as long as the watermarks remain in place and untouched it's good that a lot of the things that are uploaded and then forgotten are being stored somewhere.
Hmm, it isn't so much about watermarks, although it is nice to leave the images unaltered. I'd say if you're going to use someone else's images, try to follow certain rules out of courtesy, e.g.: Where possible, ask the original source if they'd mind Credit the original poster (or at least the site you got it from) ALWAYS re-host on your own space. Bandwidth theft is unacceptable!