When you pay much attention on what type of person are surrounding narcissists, abusive / manipulative people, you will notice there actually many co-dependent personalities are involved in the relationships.
Narcissistic need narcissistic supply and people dependent on them, no matter it’s financial, emotional or spiritually. This is kind of “demand and supply” theory. Since co-dependent personalities not able to manage their decisions / life by themselves, probably due to low self-esteem, lack of confidence, this make them more attracted to manipulative people, who love to control.
Don’t you agree?