I have been watching to see which newbies who have gotten beaten up my PP come to the board and get harassed. If they are selling something I might like, I post so they sorta get to know me. (I mean with this crappy posting ID and almost no feedback I can see where a seller might be leery of me).
THen I buy something from them. I would just be careful not to bid until the last possible moment so that nobody screws with their auctions.
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"buy_and_sell" to those who agree with me, "trash" to those who take cheap shots.