"Actually. Most conservatives understood intuitively that you could not add tons of poor to insurance roles and cover all pre existing conditions without raising prices heavily on the healthy."
I think you are forgetting a few things. ACA increases the insured pool by mandating that everybody get insurance. That certainly helps offset the increased cost of insuring people with pre-existing conditions.
On a side note, I was denied insurance before, because on the application form I could not tell them when I had last seen a doctor. I haven't in probably 15 years or more. They came back with a quick rejection. With ACA I was able to get insurance. Now they get easy few hundred dollars from me every month. I still have not seen a doctor. Don't need to.