Ascribing a "Risk vs Value" proposition to healthcare can become problematic if done to the n-Th degree. When healthcare companies start playing hot potato to kick anyone who has a condition to the curb, then they're probably looking at it too much from a profit perspective. At a certain point we just need to cover as many as possible and feel lucky that we haven't gotten a condition ourselves "yet". Most everyone will eventually have something, it's just a matter of when and if you're lucky enough to catch it soon enough. Therefore, it's probably better to not look upon people who need to use healthcare as "risky" people or simply a financial burden to contend with as we or someone close to us will certainly be in the same position eventually.
As to Obamacare, it is doing what it was created to do:
1.) Provide some sort of healthcare to those who would otherwise have none
2.) Give some help to everyone by cutting down on how much the healthcare companies can screw you over (like pre-existing conditions) because otherwise (as we've already seen) they would indeed screw you to the n-Th degree without conscious.
3.) Slow the rise of healthcare costs (not stop it, just slow it some)
Some comements on #1: Low income people and folks in their 50s/60s (pre-medicare and not poor enough to get medicaid) would have a hard time getting healthcare. Healthcare companies don't want these people because they are too "risky" and thus could dampen their profits. For older folks, it also sucks because a lot of businesses engage in age discrimination too. These corporations like to quietly lay these people off partly because they don't want to pay for their expensive healthcare or their families. Then they get it on the other end because healthcare companies want to charge a fortune because they are considered "risky". They have no recourse but to try to get to medicare age if they can last that long.
Some comements on #3: People like to whine that the rates are still high and use that as an excuse to say that the ACA is a failure. However, all it did was slow the cost growth and also, it's actually to the benefit of some to raise the costs as much and as soon as possible. Therefore, you have forces that are pushing costs as high as possible to reap the profits.
You would need to massively change things more in order to achieve a great amount of savings and they probably will never be able to do that. Too many players making too much money to change it that much. When the ACA left the healthcare companies in place as the middle-men, you already knew right then that costs would continue to rise albeit perhaps just a little bit slower.
