Each building in the complex only had 4 apartments, 2 one bedroom and 2 slightly larger 2 bedrooms, but the 2nd bedroom was pretty small. In most cases there were never more than 8 people per building and even that was a lot. It was mostly singles and couples, not too many kids.
The rugged commercial machines would probably be overkill but with enough $1.50 wash & dry loads, they probably made enough to maintain the standard machines. That' sustainable my guess, I never did the math. Of course, if enough people used the timing trick that I did, that would throw their numbers way off.