Interesting OP. Bidder psychology is a fascinating field and in a legitimate auction setting the combination of the auction rules and psychology can allow for some interesting strategies. I don't see PWCC as a good test case, though, because of the rampant shilling and the resulting perception of shilling among many potential bidders. One reason I stopped compiling prices for my guides was that the Mastro-Legendary-PWCC-Probstein business models made the data misleading.
When I look at what a card costs, I take the PWCC 'sales' with a huge grain of salt; when I analyze card prices I cull the PWCC data (and usually the Probstein data) from the numbers and use the remaining sales as my data points. If you are looking at PSA cards, the auction prices function on the site makes it pretty easy to do that since the sellers are ID'd.
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