Hire a greedy person, and your reward will be decisions based on quick-gain considerations that minimize or harm value.
Hire an egotistical person, and you will ensure the failure to think systemically and to take responsibility for an institution that is “too big to fail”. You will guarantee silo-ism and the failure to generate the cooperation and creativity that generates the most substantial value.
Hire a person for whom personal need takes precedence over the greater good, and when the storms come you will have an executive who lacks the self-discipline that brings sanity and order in the midst of chaos.