The textbook example of course being Sovaldi [1] the cure for Hepatitis C that was invented and then sold for ~84 K$ when introduced which massively undercut the prevailing treatments which cost ~40 K$ per year for a lifetime (40+ years of treatment on average).

Turns out, the shareholders really preferred getting a pile of money over other people who are not themselves getting a even bigger pile of money. Bunch of moneygrubbers ruining a good gig.

[1] https://en.m.wikipedia.org/wiki/Sofosbuvir