The Unexotic Underclass Doesn't Have Cash.
In 2007, the bottom 60% of the country had 4.2% of the country's wealth. https://en.wikipedia.org/wiki/File:U.S._Distribution_of_Weal...
Frankly, it doesn't make sense to target anyone but the top 40% of the country. Roll a 20 sided die. If you roll a 1, put in the pile that goes to the bottom 60%. If you roll a 2-20, put it in the money that goes to the top 40% of the country.
Which market are you going to get money from? I can tell you which market I'm looking at.
Now, the distribution of income isn't as disparate, but there's a reason that the bottom 60% isn't generating wealth, and it's partially because they're spending all of their money on essentials and small, low overhead luxuries.
Is it true that you can make a good amount of money in making things more affordable to these segments? Sure, but these don't seem to be the grand problems people are talking about.