If he could have, he would have.
It ain't as easy as you wish.
The port vulnerability is a good thing to consider, though.
ObL is worth much less these days.
Word is he mostly travels(ed)...)turns out the message may be a sophisticated fake) but anyway, the word was that he is/was trotting around with chests of gold and currency, carrying just a few millions.
But that is just one word.
The sob could be living in an old abandoned super villain's lair, a la Dr. No or something.
Ed