"Extreme couponers" is the wrong term to describe these folks. They were coupon counterfeiters. The article even states how the perpetrators didn't use the coupons themselves.
> Talens not only regularly used her own coupons, but she sold them to a large group of subscribers who found her through social media groups.
https://www.fbi.gov/news/stories/woman-sentenced-for-coupon-...