Barber shops can have reliable clientele who come back once a month, high demand because everyone needs them, and a viable business model if the rent is not high - labor is $20 an hour, 3 clients an hour get $60 revenue, the difference can pay for rent and operating cost. $10k-$20k revenue per month is not too hard to do. (Of course that doesn't pay rents in super prime locations, so the cuts in Manhattan cost $50 instead of $20, but the principle is the same.)