My favorite is when I leave a one/two star review, and the (always Chinese) merchant writes me, offering anywhere from $50 to a full refund if I change my review to 5 stars.

I do. I like money. Amazon doesn't seem to care when I report them.

And once the money clears my account, I change the review back. I have one on my desktop right now, awaiting a $50 gift card. I mean, I still care about people reading the reviews. They aren't completely immoral liars, like the company writing me.