I have been actively buying cards on eBay for the last several years and only have a handful of bid retractions. Once or twice, I genuinely typed in the wrong number (i.e., $1000 rather than $100), but I quickly bid the correct amount. The other couple of times I thought I was being shilled. Someone would keep putting in incremental bids until they surpassed me and then retract their bids thereby learning my high bid. I did not like my max bid being public info, so I retracted it and put in a new, lower max in the event the shiller tried to bid me up to what he thought was my max last minute.
That said, I think there are legitimate reasons but cannot think of a legitimate reason to retract 30 bids in 6 months.
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Mantle Master Set - as complete as it is going to get
Yankees Game Used Hat Style Run (1923-2017): 57/60 (missing 2008/9 holiday hats & 2017 Players Weekend)
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