U.S. drug prices should reflect value to patients but what is a "good" reward for investers?

http://www.reuters.com/article/2015/10/23/us-usa-healthcare-pricing-idUSKCN0SH2IH20151023

http://www.reuters.com/article/us-pharnext-ceo-idUSKBN0TY2L320151215

http://www.nytimes.com/2015/12/16/health/hepatitis-c-treatment-egypt.html?ref=health&_r=1