Not necessarily - They may just be buying BTC and transferring them to their personal wallets, before the price gets even higher.

Your 20% isn't sustained.  10% extra spread for hours isn't uncommon when MtGox leads a rally:

15:18 <gribble> mtgox premium over bitstamp is currently 13.3164556962 %.

Do you think the sustained spread between BTC-E and Bitstamp is because people have more trust in BTC-E than in Bitstamp?  Some people in financial trouble are buying BTC at MtGox to sell at other exchanges, but this is hardly about trust, is it?  There are more than 68k BTC for sale in the order book on MtGox.  That's a lot of money for an untrusted exchange.
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Why do you even bother to ask your question here?  Just ask support.  The bank fees for an overnight SWIFT transfers are steep.  I assume you have to be trusted to get that option, and it will probably not be a good idea if you transfer less than six digits of USD.

Anyone with a domestic bank account in Japan can make even better profit.  The fee for an overnight JPY withdrawal is only 200 JPY (2 USD).
Eh?  If it has ever been a secret, it hasn't been well kept.  You don't impress anyone buy acting surprised.

Oh, please stop barfing all over the forum.  Are you drunk or something?

MtGox staff live in Japan, and I assume most of their friends and family do as well.  Why pay a high withdrawal fee for express SWIFT transfer, when you can get a cheap domestic transfer faster?  You should stop doing drugs.

Lol is that an attempt at an insult?  Actually no there hasn't been sustained 20% variances.  Maybe tiny blips for a few minutes but none that carry throughout the day.  Yesterday did have a 14.65% sustained spread though, an all time record high. 

I never said 20% was sustained.  See chart above.  You can easily see where price variations happen with a loss of faith at Gox.  There is plenty of data points to gain a good perspective on the issue.  Jesus you are a Gox fanboy with that dog statement.  So do you consider 10-15% spreads "normal" because it isn't normal and never has been between Gox and Bitstamp until Gox starting running into financial/legal problems! Charts above prove it!

https://bt.irlbtc.com/view/179586.msg2963387#msg2963387

My wires to bitstamp usually clear the next business day. Never had an issue with bitstamp crediting wires.

MTGOX only started having really huge withdrawal of fiat problems since May 2013. So no zeroblock has enough data points to show the huge discrepancy in price holding above 14%.

Is this the new scientific standard?

And I personally think that the moon is made ​​of cheese. source: me.

BTC-e requires lots of fees to get fiat into and out of the exchange.

That spread has been known for a very LONG TIME.

This new spread between GOX and all other exchanges is nothing that has been explained thoroughly through fees etc and is not justified by anything I am aware of other than mistrust in the exchange itself.

That is incorrect.  The price discrepancy between BitStamp/Gox (12-15%) vs BitStamp/BTC-e (1-3%) is magnitudes smaller.  You are comparing apples to oranges.