That's true, but your margin for error is much smaller in that market. It's much harder to make a profit when you need to make your goods cheap, unless you are

That's true, but your margin for error is much smaller in that market. It's much harder to make a profit when you need to make your goods cheap, unless you are making them at scale, which also increases the barrier to entry. The reason Walmart is so large it because it's nearly impossible to compete with them. It is much easier to compete for the well-off twenty-something's spending.