Have you looked at expected lifetime medical cost data? Please do so. It's not "a small amount". And where do we draw the line? We could spend an arbitrary amount of money pushing medicine down the diminishing returns curve until we bankrupt the entire society.
You could if your were stupid, yes. Or you could put on your big boy pants as a country and put together an effective and humane healthcare system. Yes, compromises have to be made, you can't cover absolutely everything.
Socialised medicine works successfully in other countries to the US, including my own. That's the only data point I need.