I've made six figure revenue over the course of the past 5 years from introductions to new clients through a "people collector". Definitely a great person to have in your network!
Of course, people skills are necessary... https://www.youtube.com/watch?v=fcIMIyQnOso
In contrast, my Dunbar number is about 5. I need a few days to calm down from meeting new people. I can't imagine putting in the effort that he does in collecting people. COVID lockdown was a welcome break for me.