The good thing about finance and ad-tech (both of which I've successfully worked in) is that if you're good your clients (if any) are happy to pay you lots. With cancer, if you succeed, you're supposed to give away what you've got since not doing so is going to kill people. If you don't, you are the Great Satan.

Since most people subscribe to the Copenhagen Interpretation of Ethics, I think I'd rather not touch the field at all. Let those who are altruistic be altruistic. If I never create a cure, I need never be considered evil for not giving it away.