ok lets look at it this way. the total market cap of Mt. Gox Coins was $130 per gox coin back then.
but he can turn around and sell those at $300-$500 higher at any time.
so what does this mean. it means this. without Karpeles stealing the bitcoins, it would have dropped to $90 on ALL the exchanges.
and he bought a robot too. so that means the Bitcoins are worth a lot (like $6000 a coin
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you mis understanding the facts.
Karpeles caused the drop from $1000 to the $650 on other exchanges, because people were sheep following gox prices. it was only at the point of the $650 price that the sheep realised that the mtgox wolf was in another field and could not harm them. then the sheep stopped running around.
the price drop of $650 to $450 was more sheep following chinese bank media stories..
ok so now lets bring you back to today.
if karpeles has 740k coins. and wants to sell he would cause a price dump on all exchanges.
by not selling them he is not eating up the buy orders, and as such this means that by him or a hacker or whomever has the coins hoarding instead of selling. the price is not crashing further.. although my theory is that he cashed out via the chinese exchanges during the china bank media blitz.
i dont know where the OP believes that a sell off causes a price rise.. but i do believe that if the OP continues thinking that, then he himself is a "buy high sell low" guy that will make lots of losses in the future