You're interpreting ChuckMcM's phrase to mean "wasn't about money [at all]" but that's the wrong place to insert the quantifier. The stronger plausible interpretation (see
https://news.ycombinator.com/newsguidelines.html) is "wasn't [all] about money". Chuck is contrasting PG and Jessica to people who only want to get rich "because for them, it is all about the money". That's also what Sam is saying and also what you are saying ("wanting to make money and help people"). Problem solved.
Of course nearly everybody will say "I want to make money and to help people". The question is what they do when those two wishes come into conflict. Which is the high-order bit? There were many cases when PG and Jessica chose the interests of founders over optimizing their own money outcome—in fact this happened so often that it became proverbial, and many experienced people in the investment business were puzzled by it, as if there had to be some other explanation.
There's another characteristic that PG and Jessica had/have, which doesn't get mentioned as often: they simply wouldn't spend time on things that they didn't enjoy and didn't feel were essential. That's also true of Trevor, and probably of Robert too (I don't know him as well), so it was something all four of them shared.
That quality was for sure more important than optimizing for money, and may even be the high-order bit. Things that were supposed to be the 'proper' way but which weren't satisfying and didn't have an obvious justification, they simply wouldn't bother with. Complex negotiations, for example, or paperwork that wasn't absolutely necessary—even if nontrivial amounts of money got forfeited as a result. This approach turned out to be incredibly efficient and in retrospect looks like a superpower but I think a lot of it was just refusing to do dumb or boring things. Which actually is a superpower, but not one that most people would see that way.