So preventable deaths for low-income people increase dramatically as they spend their £500 on fuel, rent or booze instead of surviving the heart attack they did

So preventable deaths for low-income people increase dramatically as they spend their £500 on fuel, rent or booze instead of surviving the heart attack they didn't know they were going to have, and then put off calling the ambulance because they're unable to provide payment details. On the plus side, rich people get rapid, efficient ambulance service whenever they dislocate a finger or feel a bit nauseous. I'm not sure that was the solution to the triage problem the OP was looking for though. When you have objective metrics like survivability to assess performance against which trump individuals' personal tastes, a market is almost always laughably inadequate.