The ethical question of how much can you charge for a cure while the demand for one is high is the question many of these companies are having to face. Justifying the price of medicine that potentially could save lives is a hard task. Some companies argue that the medicine that is helping patients heal is also saving hospitals and insurance companies money by healing the patients, thus justifying some of the hefty price tags that come along with the medicine.
Source: https://www.dw.com/en/coronavirus-wealthy-nations-compete-for-remdesivir-supplies/a-54030122