Recently, there was an SPA auto RC card that was posted on eBay and sold for a ton. It is special because the card had not been posted before, and may have been a ridiculous short print due to a number of reasons. Not surprisingly, the card went for multiple times what Beckett said it was worth, and the argument was born:
However I will agree Beckett is somewhat in the dark on real value as compared to Book Value. I use Beckett pricing for trading and a starting point in regards to selling."
Collectors are intrinsically stupid.