Yeah, it's worth more like $50M if you place your sells across exchanges:
1,600,000.00 bitcoins can be sold for 35,066,701.01 USD on Mt. Gox with a slippage of 1,544,789,298.99 USD (97.78%)
222,043.14 bitcoins (insufficient bid volume) can be sold for 15,395,973.27 USD on Bitstamp with a slippage of 1,493,404,026.73 USD (98.98%)
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Some people estimate his net worth to have been not 20,000, but 1.6 million bitcoins. That adds to over a billion dollars.
http://motherboard.vice.com/blog/who-is-satoshi-nakamoto-the...
But $1B in nominal marginal priced BTC is faaar less liquid (less order book depth) than most other assets.
Yeah, it's worth more like $50M if you place your sells across exchanges: