Him directly stealing weapons have been mentioned a few times, but I'm honestly not a big enough Punisher fan to know his economic breakdown in more detail. I mostly just read them in crossover events.
Still, he's comfortably far above Rorschach, and far below Bruce Wayne. It's at least reasonable enough that I'm not surprised that he's not funding orphanages. Dropping off a bloody sack of weapons or something doesn't seem like something most charities would want.