The banking limits aren't unbelievable- if you live in Japan. Its standard bureaucracy. And the 5% is likely not a withdrawal at all, but a fiat to fiat transfer through a regular bank which charges them for it (though there is obviously a percentage in it for them as well). And when a bank is forced to submit reports on incoming transfers over $10k USD (in the US) to regulatory agencies, they also aren't allowed to tell the customer they are doing so (this is a fact). So EVERYTHING is a delay EVERYWHERE.
What about SEPA withdrawals coming out from Gox's Polish bank? Why 6 weeks delay?
If reporting every transaction above $10k causes so much delay, why I can wire 50k EUR to MtGox and I get them credited in 2, 3 days max.? Why the huge delays affect only outgoing and not incoming transfers?
It doesn't add up. Other exchanges have no problems with "banking limits".
Mtgox is the problem. They likely do not have all funds otherwise they would be able to allow fiat withdrawals in the same reasonable amount of time it takes to deposit funds with them.
A ponzi works the same way....easy to deposit funds but difficult to get funds out.
The laws of economics and finance do not change with mtgox.