@ossobuco,
After starting this post I was worried about the "use the poor" aspect of things and that's why I started reading about pawn shops.
Truly, it doesn't seem like there are many things the poor might be selling that a pawn shop might be willing to take. But then again, I don't know -- I've never been to one.
Stolen items don't seem to be a problem. They have to turn in reports each day listing serial numbers so stolen property would show up.... that is, of course, IF the item has a serial number and the person who had it stolen had bothered to record it.
I'm pretty comfortable in buying a used camera IF I can hold it and shoot it and look it over. I don't think I want to buy online. The layout and "feel" of the camera are probably more important to me than most of the bells and whistles available on a lot of cameras.