The policy of hiding
ebay bidder names was done in part to stop people like me who would contact bidders and ask if they were aware they were bidding on a counterfeit. I used to do that at least 10 times a day and I had a form letter I copied to save time. I asked the bidder to write for particulars (proof).
ebay considered that Bid Tampering - I was cutting into the "legitimate" business of several large volume sellers (all from China - well before it became front page news about their fakes).
Identifying bidders also allowed me to track shill bidders - but
ebay never did anything. There was one case I recall about 8 years ago, where in one week ONE NEW BIDDER (from China) bid over 200 times on ONE SELLER'S (from China)counterfeit pillar dollars - winning NONE but driving up prices 100% (about $4000). In the same period - he bid on NOTHING else from anyone else. He passed up all other Pillar dollars. I sent all the data I gathered to
ebay and they said it was "not adequate" to prove anything. Both bidder and seller disappeared about a month later - but
ebay got their fees. In one weekend, while I was still tracking these guys they sold over $12,500 worth of modern counterfeit JUNK. ONE WEEKEND!
But during the period when identities were open, I met a lot of new friends - some I still correspond with nearly 10 years later.
I also tracked people who collected counterfeits. I had a list of nearly 350 when
ebay changed the policy.