There's a difference between wiring cash and smuggling. I'm not sure they're related.
They do a lot of money laundering operations. Sometimes they ship money out in suitcases from their front businesses to a contact overseas.
My guess would be they use all types of transactions to withdraw and preserve their money.
Not necessarily. Wire transfers are easily traced. In the pre 09.11 world, that was not really an issue because we weren't targeting the financial backbone of AQ et.al. In the post 09.11 world, tracing wire transfers and other financial transactions is a key elemement of the war on terror. Smuggling the cash is much harder to track.