There are constraints on reducing pages. For one, papers prefer to print in multiples of 4 or 8 pages. It’s possible to print in multiples of 2, but it’s less efficient. Furthermore, you have to have a certain number of pages so that you can sell enough advertising. With a smaller broadsheet, you can slightly reduce the size of the ads. However, if you reduced the number of pages, you would lose a lot of ad space.