For leading people 3 CH is useless without drugs, 1 CH is useless with mentats. Most people have 1 CH since they can lead people anyway which makes a cheap drug like mentats useless. A simple system makes the exact CH number the amount of people that can be lead, and makes mentats useful for 1 CH players. 1 CH and a mentats can lead 3 people.
Simple system: 1 CH leads 1 person, 2 CH leads 2 people...7 CH leads 7 people and such.