TL;DR: I don't care about making "as much money as possible". I only care about making enough money to survive comfortably and help others when I can, which I'm already doing. In fact, I'm currently working towards switching careers, and in the process I'm more than willing to take a pay cut if the new job is more fulfilling; I can afford to.
But otherwise- there's a difference between "trying to make as much money as possible" and "keeping a casual eye out to see if you could be making more money doing roughly the same thing you're already doing". Imagine if you could give twice as much to St. Jude's, or pay off your student loans completely, or both. There's a huge gap between being greedy and letting money rule your life, vs not giving it the slightest attention. It's worth putting in the baseline effort, especially if you're not having to sacrifice any of your other life priorities in the process.
That said, I'm doing the job switch thing anyway; not to get more money, but because I've grown to hate my career and am hoping to switch into a more creatively fulfilling one. If I can find such a job with a larger paycheck, of course I'll take it; but I'm also willing to take such a job with a pay cut if that's what's available to me in the new industry.