I've found that the "average" price is frequently pretty biased; I've done a few trades where the "Minimum" prices are sub-ten-cents, and the depth of the market supports those prices, but the high price is $1.99, which skews the "Average."
I don't know what TCGPlayer's API looks like, but it seems like the "TCG Average" used by deckbox doesn't reflect market depth. If possible, I think a lot of pricing irregularities could be addressed by changing the pricing model to a weighted-average approach. $100 Beta versions of a $1 card would still skew the weighted average, but if there was only 1 Beta available and there were 100 M12 editions, the weighted average should still be close to $1, as opposed to $50.
EDIT: Meh; I suspect deckbox probably just has access to TCGPlayer's low/avg/high prices, and doesn't do any calculations on its own, so this is probably entirely moot. Oh well...
Last edited by mholger (2012-03-30 12:57:43)