But the article doesn't seem to have a measure of profit. They look at rent and purchase price, and later throw in something for maintenance. If they actually

But the article doesn't seem to have a measure of profit. They look at rent and purchase price, and later throw in something for maintenance. If they actually had the books, and could count how many employees were needed to deal with stuff, and how often the rent was unpaid, etc, then they would be justified in talking about profit.