Only when it doesn't endanger their ability to make a profit.
Ultimately, they're meant to disseminate knowledge. But their narrow appeal makes them expensive to produce and harder to sell.
Congress wants to know.
It's heavy, it's not good for the environment, it's too expensive for all but a select few—and yet, every year, the 17-pound catalog arrives again.
Using too many trials to design investment algorithms renders them statistically useless and potentially devastating.