Yes, a good successful job can be done much cheaper - but, on the whole, the odds of success & quality degrade fast when less is spent. When it is YOUR life on the line, you may very well be willing to pay significantly more for those diminishing returns; they may be diminishing, but they are in fact greater returns. "Healthcare tourism" by Americans includes the ability to identify & access those pockets of excellence; those areas in general may not enjoy such inexpensive quality as the norm, nor have easy access to excellent outliers.
BTW: Americans (I speak as one) are a chronically dissatisfied bunch. Having remarkable access to excellence in all things, we bitch & moan about how it isn't oh so slightly better. Yeah we complain about the cost of healthcare, and at the same time demand the absolute very best, quick to sue the pants off any doctor whose work fails perfection standards by any statistically normal degree when something could have been done better regardless of extreme cost. I suggest caring little about opinion polls where objective statistics are available.