That only proves that failed bidders bid below the market rate. If anything, these bitcoins carry a premium for the same reason that "tainted bitcoins" carry a discount.
The fact that Tim Draper won every single lot in that Silk Road auction suggests he paid a premium.
Who knows? I do remember keeping a close eye out and everyone who spoke of their bid said theirs was under market. Can't remember how many said anything but it was a few.
It doesn't really mean anything. There'll be good days and bad days when the buyers don't show up in the same numbers. It's not much of a reflection of the market elsewhere. There's only so many buyers at this level and only so many who bothered to qualify.
What is the point of bidding if you do it at market rate or above? For that you can simply go to an exchange...
If i had the money, i would do the same: Bid at lower price than market, else its pointless.