Meh...doesn't affect me.
I was shafted of $363 by a seller with over 300 way back. Short time of a member, he was, though. Can't remember how long.
What I worry about is these "lotteries." Look up the words "mystery auction." Type in Wii, PS3, Iphone, any big ticket item. You'll see regular sellers claiming that they are running these auctions, and you're bidding on a piece of paper, and whatever is on it, they give to you for free. Every single one speaks the same language, claiming it's legal. They're all doing it to raise their rating. No doubt in response to this policy.
Who's monitoring these things? Who wants to bet any of these people are giving away what they're claiming? There's absolutely no way to verify it!
Some go so far as to say that the people bidding shouldn't divulge what they won when they place their feedback. Some others make it a private auction.
I don't have much of an internet presence, so I can't really make some noise on this scam, but it undoubtedly has to be one, and people should spread the word on "mystery auctions."