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> The market capitalization is only 500 million dollars.

Emphasis mine. That seems crazy high. How many million dollars would you pay for all of the existing bit coins?

That's somewhat of a silly question for bitcoins, since the value would change after that transaction.

For stock market valuations, though, that question is much more productive.

(You can't pay any million dollars for all bitcoins because unknown scores of thousands have been lost or otherwise become inaccessible.)