It's because they need the money. If your job options are limited (few readers on HN know what this feels like) then any paid hours are better than none. A 10

It's because they need the money. If your job options are limited (few readers on HN know what this feels like) then any paid hours are better than none. A 10 hour shift means 10 hours of money. Now it will be 11 hours of money. Except your shift will be cut to 7h.