Extreme Couponing!

I'm watching TLC's Extreme Couponing. This lady had 9 carts of groceries, totaling $1050.00, she gave them her coupons and paid $51.00 cash. WOW! but she also paid $70.00 for the coupons on-line. That still a huge savings. But she had tons of stuff that she won't use for years. Her husband called it all crap. I say she should donate lots of it to a food pantry. Do any of you use coupons?