My guess is that the ping-pong robot posts an offer to sell and immediately buys into it, or vice-versa. These transactions add to ~100 BTC per hour, and a large fraction of MtGox's volume.
A large fraction of all exchange volumes are fake trades -> the big deals are done without exchanges.
The exchange rate was and is heavily manipulated by a few individuals including the exchange operators.
Best example -> GOX crash failsafe: It's just rollbacks all trades for a specific time intervall. Happend every time someone tried to really push the price down.
There is a large amount of fake support to keep the price going up -> more profit for some power holders
Don't believe that bitcoin is played fair and honest. Some will wake up sooner or later from this dream of great wealth without doing anything.
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