Earlier quoted context omitted.
Your claim is the flip side to the joke that goes something like, "The law is blind to class: it is equally illegal for a rich man to sleep under a bridge as it is for the poor man." The point being: a large fraction of the population in the US is living paycheck to paycheck and has no money to spare for investing in an index fund.
And yet many blow at least $3000+ per year on worthless consumables like cigarettes and lotto (at least my pack-a-day neighbors do). $3k per year in an index fund is certainly not insignificant.
being poor impairs your cognition[1], so it's not surprising that they are wasting money on stuff like that.
[1] random google result: https://www.scientificamerican.com/article/how-poverty-affec...