Comment by mrb

A lot more than 177k BTC changed hands yesterday. You don't see it on the block chain because most of it is transacted off-chain: 788k BTC were sold and bought on Bitcoin exchanges in the last 24 hours - http://bitcoinity.org/markets/list?currency=ALL&span=24h So 50k BTC is really nothing (~6%) compared to what the market usually handles every day.