I don't see anywhere in your cited article that says the coins were purchased for more than market price. Can you point it out for me?
Additionally, if you were a rational investor who believed the coins were worth above market price, why would you not additionally buy up any coins on the market that were selling below that price? Ultimately, bidding up the market price to whatever the "above-market" bid was.
Additionally, if you were a rational investor who believed the coins were worth above market price, why would you not additionally buy up any coins on the market that were selling below that price? Ultimately, bidding up the market price to whatever the "above-market" bid was.