What are your thoughts/experiences with Cut-Throat Personality types?

Ever met someone who fits that description? Someone who will stab someone in the back if they thought they’d earn a penny and/or earn points with a certain socail/business group?

Do you know someone who stopped being that way?
Do you think being cut-throat is a good thing/bad thing?
Are you a cut-throat type of person? Can you share some stories?

discuss and stuff