Extreme Couponing

Have you watched Extreme Couponing on TLC, yet? It airs on a night I typically work and isn't available On Demand, so it took me awhile to catch an episode. I am always looking for ways to save money at the grocery store. Unfortunately, this show doesn't have the tips I thought it would.
Some of the "couponers" have very meticulous systems. One woman said she spends at least 20 hours a week on her coupons. If only I had that kind of time. The thing that really bothered me about the show is that even if you have that kind of time to devote to clipping and sorting coupons, checking them against ads, etc., you're still probably not going to walk away with $400 worth of groceries for $10. Why? Well, I don't know about the grocery stores you frequent, but the stores I go to don't have the same policies as the stores these "extreme couponers" use. Most stores, at least the ones I go to, won't let you use more than one of the same coupon, no matter how many of the same item you're buying. The one store I frequent will let you use up to three of the same coupon (as long as you're buying three of that item), but not the 10+ the people on the show are getting away with. Am I going to the wrong stores, or are these shoppers being allowed to this because they're being followed by TV cameras?
For now, I'm not going to be able to be an extreme couponer. I'll just have to stick to my shopper's card deals and on-line and newspaper clipped coupons... and whatever tips you feel like providing in the comments!