alt Hacker NewsBlack market and gray market data. All the firms want data. All the other firms want data. The banks want data. The other criminals also want data for their crimes and schemes. Oh insurance companies, and the ATS systems. Everybody wants as much data as they can get and they don't care how they get it.
This data selling also happens with leaks of all kinds like medical data, often to current or future employers, health insurance companies, etc.