Actually, the fact that 97% of that bidder's bids were placed on items being sold by one particular seller, while possibly suggestive, isn't proof that the seller is engaging in illegal activity as you suggest. Since that 97% is based on activity for a relatively short period it is hardly conclusive.
You're bidding on an item being sold at auction. It is unreasonable to think that there would not be other bidders bidding on the same item. It also doesn't follow that because you were outbid by another of these bidders that the seller is engaged in criminal activity. Since you, as a member, do not have access to all the data needed to support such a charge, your only reasonable alternative is to report your suspicions to eBay for investigation. However, it is doubtful that eBay will give you the results of such an investigation owing to privacy issues.
Since 2008, sellers have only been permitted to leave positive feedback for buyers or none at all. Being that feedback on eBay is, and and always has been, voluntary, many sellers have chosen the latter option and many buyers have chosen to do the same.
You failed to mention if, after being outbid, you eventually won the auction. If not, it would indicate to me that there was no shilling taking place as it is not a shill's intention to win the item being sold.
Of course, as a seller yourself, I would expect you to be aware of everything I've mentioned.
"It is an intelligent man that is aware of his own ignorance."
