A couple of these are really tempting. I need more information about Amazon, specifically do I get to choose the free items? There doesn't seem to be any stipulation that I can't resell them, so that's good.
Seems easy to loophole around as well. Since the downside is “you” can only shop at Amazon, you just need someone else to do your regular shopping. Of course you could be screwed if Amazon ever shuts down.