I think you’ve misunderstood the comparison with candy bars. Many medicines that health insurance companies charge through the nose for are sold for very little, sometimes pennies a dose, in other countries.
Insulin doesn’t actually cost that much to make. Two to four dollars a dose.
Paracetamol is dirt cheap. In the UK it can bought for as cheap as a penny a tablet, and that’s twenty times what it costs to make.
The insurance companies charge stupid prices for them though, despite them being of similar production costs as candy.
I think a better analogy that hits both points would be a glass of water