Where is the money then?
Who owns them?
The logic behind buy and sell, is that before a price can increase/ decrease there need to be some money / btc in the system. If the ppl have money at their accounts they are exchanging those to Bitcoins and vice versa.
If no money can enter or leave the system, then it makes absolutely no sense that the price is dropping, except that the clever ones must be very happy to receive cheap Bitcoins. Theoretically the price could increase 10-fold, due to the fact that the system is isolated.
Common sense must denote that it is extremely stupid to exchange anything at an exchange that is heading for bankruptcy.
Why do most people think that the money is coming from MtGox, when they actually should/ are coming from the customers that use MtGox.
The only way I can see that MtGox is not able to payout fiat, is that the fiat is lost/ stolen from the accounts (and has been for a very long time) and that the fiat-amount one could see in their account balance was fake. (i.e. the money behind it was gone/ deported to the MtGox-scammers)
Just my 2 cents