On the other extreme, the yellow journals a few years ago, put some of their best cartoonists and cleverest writers into the sporting department. This created an artificial demand for "sporting stuff" far beyond the natural appetite of even an English-speaking people. That demand became so insistent that the other newspapers of all shades of opinion were forced to meet it; and now no newspaper is so conservative and intellectual as not to have a sporting page.
So to be specific, newspapers have sports sections because of propaganda. In one word. Because of yellow journalists. You could enlarge this into a phrase: newspapers have sports sections because they manipulate their readers. Only in the most generic of all senses can it be stated that newspapers have sports sections to make money. They essentially expanded their product line through the use of propaganda.
I wrote a larger posting about what's contained in the first part of this study yesterday, here, where other ways that newspapers manipulate people is illustrated, and he's not talking solely about the editorial pages where opinion rules.