The interesting thing about it is that if he sells those coins on the exchange, the value will substantially drop, so it's not $100mln in the bank. However, he

The interesting thing about it is that if he sells those coins on the exchange, the value will substantially drop, so it's not $100mln in the bank. However, he could buy 100mln worth of items from vendors that use btc, and the vendors will sell off the 1mln btc but won't be able to get the price of the purchases back. That's assuming that if there was a big order of items and paid in btc that the vendor would sell immediately.