Regarding "making a profit" - I think the ambulance service is almost uniquely suited to doing this, in a very direct way. When you help someone, you should, obviously, take whatever money they think your service is worth. Withholding said service until such time as they use their ebbing strength to throw their wallet at you will, I think you'll find, make this situation a shining example of modern neoconservative capitalism in action. This also neatly accommodates the poor. You'll take whatever someone has, no matter how little it may be. Oh, and you'll also take what you can carry from their house. If that turns out to include their car keys, well, then that's another bonus, isn't it!