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JimBOf course there is shill bidding. How pervasive it is, is mere conjecture. Due to shilling there are some false numbers on VCP. If you have a sense of the sellers, you get to know which ones are trustworthy. Just yesterday I was going through some recent sales on T206 HOFs. There was one seller reporting #s at about 30-40% higher than anybody else on virtually every card he sold. I just disregarded all of his sales and made a note not to bid in his auctions.
VCP can help combat falling prey to shillers in this way as well. One has to learn how to use the information intelligently.
JimB