At some point in your life your time and resources will be quite constrained, and you simply can't help everyone. You need to strategize who to help, and identifying "leeches" requires some level of score keeping.
I've certainly had multiple people speak ill of me to others saying that I stopped trying to connect with them. They fail to mention that in the last N years, they never connected with me. It was always me initiating the phone call/email, etc. And I can say that definitively only because I had phone and email records going back years. Simple thing to script.
(BTW, not recommending you stop calling people because they never call you - merely illustrating people's lousy behavior in response to it).
[1] You're always going to have to give a lot more than you receive. Networking is fundamentally very inefficient, if you make this a metric.
You can’t ever know if the first statement is true without keeping score.
In other words: to get the things you want, convince yourself and others you are being selfless then ask them for stuff.
Anyone who is interested in helping people out truly selflessly can secretly send me money on a regular basis, and I’ll make sure it goes to people who need it and take credit for it. You can be helping and not keeping score just like the book suggested.
Wait… to get the book or a course or coaching I need to pay first? Oh I see… it’s “give me exactly this much stuff first, so I can tell you how you should never do that.”