You are mistaken. In the last 30 days, on the top 3 exchanges (btcchina, mtgox, bitstamp), there has been more than 3 million bitcoins sold [1], and yet we saw the exchange rate increase over the last month. So it would be relatively easy to sell 189,000 bitcoins, spreading the trades over 30 days, even on only 1 of these exchanges, without causing a big crash.

[1] http://bitcoinity.org/markets/list?currency=ALL&span=30d