Then you'd have to explain why every reputable newspaper is putting up paywalls and all the quality sites that used to cover specific niches went out of business in the last 20 years.

Saying "revenue goes up with content quality" only makes sense if you compare one poor site with another, but when you put in terms of ROI, you will see it is a lot easier to set up hundreds of different content farms than to keep a sustainable source of well written, reputably sourced reports.