Short version: if they bill you, and you cannot pay/you declare medical bankruptcy, those of us who can and do pay end up subsidizing your treatment. That socializes the funding of your care, because those who can pay are covering those who can't. Thus, if you couldn't get the discount you needed, you would be all for socialized healthcare (healthcare where the cost is paid by distributing it among many in society). Since medical bankruptcies are the number one cause of personal bankruptcy, over 60%, that isn't as unlikely a scenario as you might think.
Personally, I
didn't think the ACA would be found constitutional and thought
a better method would have been to use multi-state compacts to compare healthcare systems within the US. Moving to something like a public option seems a much better system than mandated private, but I think that should have been tried on a state level before being pushed federally. Now that it has been found constitutional, though, I'd prefer to see a better system than the mandated private insurance.