Bruce- it's not difficult to determine the total amount of money spent at any given auction, that information is public. But if auction house XYZ sells $1 million worth of cards in their spring sale, how do you know if 100, 200, 300 or more bidders won lots? And how do you know who spent 100K and who bought one $300 card? I know you can extrapolate some information, but I can't imagine it's all that accurate. It's reasonable speculation at best.
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