How so? Let's say you try to kick ass at your job (let's assume for a second that you're a software developer), learn the newest/hot technologies, do some side projects and move to a hot tech hub. Unless you've already done that, you can easily double/triple your salary in a matter of a couple of years. That's not crumbs.
Another example - working out. It's amazing how much more women are interested in me now that I have modicum of physique (and I'm FAR from the Men's Health models). That's also not crumbs.
The requirement that I move away from my home eats up an awful lot of my not-specifically-work-related efforts. Gain salary. Lose contact with existing friends and family. Pay extra salary in inflated housing costs, food prices, and taxes. Maybe also commute longer.
I have had annual performance reviews that say I kick ass, some that say I am just "meets expectations" in all categories. Either way, I only get a 2% salary increase. The jobs around here don't pay extra for superior competence.
The limiting factor on my nookie is spousal libido. My exercise and fitness levels have no observable effect on it. Nothing I have ever done seems to have an observable effect on it, actually.
I feel like a mime. No matter what direction I go, my nose smushes up against that invisible wall, and I can't find where it ends, so I can get past it.
It's probably not the world. It could be just me. The walls might be of my own creation, and now I just live in the invisible box I have built for myself.
But it could also be that I am surrounded by Homo economicus, and I am already standing at the local profit maximum. Nobody cares about who I am or what I do, so long as they can make the maximum amount of money from me. Nobody really wants the sprockets in their machine to grow extra teeth.
And your actions play a very important role in the outcomes. Sometimes different are better.
So not without violating my own ethical code, I can't. And if I compromise my own ethics, the change I create will not be for the common good.
It is not my world, anyway. It still belongs to those acting under the precept "might makes right". The systems of control still rest easy upon the foundation that humans are easy to murder, and their corpses are easily forgotten. In video games, protagonists can slaughter their way across a whole state, and get little more than little red, white, and green numbers for it. In reality, if you change the world, it might not be for the better, and you and everyone else will have to live with the consequences.
I know I could change the world. I have even identified some means of doing so. But when I assess the likely effectiveness of those means, the only ones that even cause a momentary shimmy on the global change-o-meter involve horrific atrocities. And in many of those scenarios, I cannot escape angry retribution from somebody. Changing the world is a punishable offense.
So I'll just eat the bread and watch the circuses, and try not to attract too much attention from the sociopaths, thanks.
Whenever I think that maybe I could have had a better life if only I had done X, it always falls apart on closer examination. It wouldn't have been better, it just would have been different. I still would have been me, and that person just isn't cut out to be independently wealthy, or famous, or influential, or even noticed. In this kind of civilization, I'm a nobody.
In the end, it hasn't mattered whether I was good or bad at my job. The world simply does not care whether I pursue sloth or aresteia. It would have kicked me in the teeth just as hard if I was a driven genius or just a lazy smartass. You leave a lot of opportunities on the table when one of your major life goals is to not be the same sort of exploitative asshole that you have always hated dealing with.
So I have played video games, still play them, and don't feel even an iota of guilt or regret about what else I could have been doing instead. And I read escapist fantasy/sci-fi novels. And I indulge prurient interests. And I eat too much candy, and don't exercise enough. For me, working hard has always paid off about the same as coasting. If ever I lift a finger to do better for myself, someone comes along and eats up my efforts, leaving me with a pile of tasty crumbs. They're nice, but probably not worth all the effort and sense of moral outrage.
If the world wanted me to do more with my life, it wouldn't have filled itself with parasitic and predatory humans.