Within a 20 mile radius of my house, I have four stores with the word "Dollar" in them, plus a Five Below (everything is $5 or less). My immediate neighborhood is impoverished, but there are high class communities close by. These discounters seem to thrive, not just among the poor, but the affluent as well.
Alas, the local Big Lots closed a few years ago. Of all the cheap stores, Big Lots was my favorite. Used to buy a giant size bag of cellulose sponges there for a dollar. The sponges were all rejects due to size, shape, cut, maybe the color was off -- nothing that would interfere with absorbency. As long as the sponges did what they were supposed to, I didn't care about trivial defects.