I've seen suspicious bidding as well since I've been on ebay, which goes back to when the site first started. It's really hard to pinpoint.
Ebay says that it becomes suspicious when a bidder only bids on certain dealers (like one or two)
However, in my experiences with dealers I tend to bid on the same few dealers over and over. I think one dealer I've won over 400 auctions and I've never met him or know him. I just trust certain dealers with baseball cards and I'm sure I'm not the only one.
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