Is this rhetorical question before or after taxes take away most of it? Having that kind of cash where I work would be insane, if thugs can go kidnap and kill for ransom some guy who only earns 30,000 dollars a year without remorse, why would anyone think a guy with half a billion dollars would be any safer living in such an area? I'd be too busy worried about looking over my back or driving in highways at night with armed cops wielding AK-47's popping up waiting for me.
Again, with high tech miniature GPS devices that can be secretly injected under your skin you could always hire Chuck Norris to be your personal bodyguard and find you wherever you are, that ain't such a bad idea. Nobody would ever want to harm me if Chuck was going to be the last face they'd ever see!
If I had 1 million dollars I'd buy a nice apartment in Spain and get a fast track path to a EU passport, might come in handy..