re: Mt Gox suspends U.S. dollar withdrawals from bitcoin accounts

MtGox is probably losing money on transactions denominated in U.S. dollars. Since they lost the ability to conduct business with U.S. banks they are forced to use foreign banks. And those banks are going to charge fees for conducting transactions in a foreign currency. One fee for the deposit transaction, and another fee for the withdrawal transaction.

This should be more than ample evidence of what can happen when businesses disregard regulations imposed by governments to protect their currencies and collect taxes. They can erect barriers to businesses that make them uncompetitive, or even unviable.