...Those 180'000 BTC were kept away from the market; and part of them, at least, must have been bought by SR customers on the open market. So Ross was obviously accumulating. I would even guess that he had been holding almost all the bitcoins that he got.
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That's important, DPR was in accumulation mode during 2013, and if now BOTH him and the US gov believe it's time to cash out, then they both expect much lower prices in the near future.