Not to nitpick, but in my experience growing up in the Midwest of the US most "poor, but educated, families" like mine pushed children into state schools where they pay in-state tuition and graduate with $10-40k in debt. Most careers are open to them and you would almost definitely not be working at McDs or in jail.
So ok, we're comparing realities that might not be comparable. I also didn't have as bad as others, but in my case something like "in-state tuition" was essentially unthinkable as well as any sort of debt. If you have nothing, first it's unlikely someone would borrow you the money and second it's a terrifying prospect and a lot of money.
The US poverty line is about 15k for a two-person family. That would mean that earning that much would make 1-3 years of family income in debt.
Not only that, but the degree to which you have nothing directly affects the amount of aid (loans) they are willing to provide.
I have a twin sister whom was better at saving than I. When it came time to apply for FAFSA loans, she had $2k in the bank and I didn't. She qualified for exactly $2k less in loans than I did.
Absolutely. In the book "Ahead of the Curve" the author describes his MBA classmates at HBS emptying their bank accounts by buying BMWs so that they qualify for more student aid. I've also seen medical doctors in private practice leave for a public health or VA job when their children are nearing college so that they can qualify for more aid, then return to private practice after the children finish college. When the system is set up to charge a high sticker price and then discount based on an "ability to pay" formula, people will do everything in their power to adjust their finances to appear unable to pay.
The lesson there is that those whom are irresponsible get further ahead (by having the irresponsibility discharged).
This is what always irked me about how the bailouts were handled. They should have been controlled government regulated destructors that would tear off and re-attach resources that were viable to other companies and leave the investors with none of their investment.
For many people who have nothing and earn little, being free of debt is an absolute core value, far beyond the mere numberical delta. To people who perceive zero debt as a central measure of personal achievement and self-valuation ("at least I am not in debt"), going deep into the negative for some quasi-entrepreneurial investment that may or may not pay off feels extremely wrong.
People on HN may ridicule them for being stuck in an optimization for a terribly low local maximum, but the danger of feeling "rich" on a fat loan is real: "if it's ok to burn through a decade worth of low wages to get to where I can easily pay it pack, what difference does it make if I burn through a few years more?" Valuing debtlessness is the established safeguard against that and going deep to exit high would be perceived as close to amoral by their peers.