Vulnerability researchers? For public projects, there's a strong preference for prestige stuff: ecosystem-wide vulnerabilities, new attack techniques, attacking cool new tech (e.g., self-driving cars).
To pay bills: often working for tier A tech companies on intellectually-stimulating projects, such as novel mitigations, proprietary automation, etc. Or doing lucrative consulting / freelance work. Generally not triaging Nessus results 9-to-5.