I'm not sure what you are asking, but I directly observe that, when presented with the choice between doing something hard that pays off a lot, or doing something easy that pays off little or not at all, that there are a bunch of people in the first camp and a bunch in the second camp.
This doesn't strictly break down by SES, either, although there are certainly trends.
You can come up with all sorts of reasons for the second camp's behavior, and many of those reasons are likely true for some subset of that camp. But at some point you have to recognize people's agency in their own behavior, or else they are just children in your eyes.
when presented with the choice between .... bunch of people in the first camp and a bunch in the second camp.
This is a VERY narrowed perspective.
Unless these behaviors are constant across all areas of one's life, they only tell you what one's priorities are.
Because someone may sacrifice short term for long term gain in their career, while at the same time sacrificing long term gain for short term satiation when it comes to food or health.
So truly what can be said about this marvelous developer, and about his ability to hold on for long term outcomes, when she refused a Google buyout offer and took her company public, when at the same time she pushed back starting a family, eating healthy, and working out.
My point is NO-ONE belongs to one camp and one camp only. You and I, and all others belong to both camps.
Are you suggesting the people "cracking" only 10 lack the ability to work 60 hours weekly?