Here’s an interesting article on the costs of keeping someone alive, and when it might not be worth it. My personal opinion on this is that I would not sacrifice the rest of my family’s life and money to try to stay alive a little longer.
http://www.cnn.com/2006/HEALTH/08/15
What would you do if the doctor said, “You’ve got 3 months to live. We might be able to extend that for an average of 4-5 months but the cost is $100,000 per month”, or some amount that would wipe your net worth right off the planet.
I dont think I would put my family through the emotional or financial stress of keeping me alive for the next 3, 4, or 5 months if it was CERTAIN I would not live.