194,993 * $800 is roughly $150 million, indeed.
But try to throw (to sell) these 194993 BTC at MtGox (or elsewhere) at once.
Such a volume would move the BTC price to hell.
Hence the Bitcoin valuation is't real...
Yesterday I was a dog. Today I'm a dog. Tomorrow I'll probably still be a dog. Sigh! There's so little hope for advancement. -- Snoopy