Cross the wrong people and you end up not dead, but irrecoverable. Cement shoes, buried alive kind of stuff.
Cross a different set of wrong people and you become a labrat.
To avoid either scenario, you'll be in a constant state of "undocumented" or false-documented which will keep you in a pretty consistent state of poverty.
There's a book I heard about where the main character is immortal. Nevertheless at one point he pisses off some mafia dudes, and they nail him inside a barrel full of urine and throw him in the sea.
Just a random thought, but it would take a lot of work (or institutional access to some portable toilets) to be able to get enough piss to fill an entire barrel