Even with an auction that is almost 30k bitcoins that someone is buying at auction instead of going to the exchange. Why would someone do that instead of just buying on the exchange?
They would only do that if they can get them cheaper at the auction. And why would someone with $25 million want to buy cheap coins? To sell them. Where do you think they would sell them?
If someone with $25 million wanted to buy and hold, they would have done so by now.
Nobody buys 30k coins on exchanges these days. Buyers for those coins will be big guys and those do investment of that size out of exchange.
Of course those coins will be bought to be sold or traded with, just like any of thousands of coins bought daily are bought to be sold or traded with. Just like SilkRoad guy would sell them at some time if they were still with him. What we should do - ban people from selling coins?