Kinda fucked up that it's not only about being smart or having the tenacity to acquire these kind of jobs but that it's also depending on the altruistic mindset and resiliency of people. The pool of people having most if these traits is quite slim..
Don't forget that sometimes you also do work for that journal, telling them if a paper is good enough or not for them, and also basically don't get payed.
To stay obvious, what's fascinating is that those networks are small, its members the most intelligent people available and they meet each other regularly in person at conferences.