Walmart coupons

Have you seen the latest on cable reality TV?  The people they show  cutting coupons, they go into the store purchased five or six hundred dollars worth of things and after they used their coupons they only spend twenty or thirty dollars. That's great but do they actually get anything they really needed? And what are you going to do with the lifetime supply of most of the stuff . I wonder if they sell it cheap to the neighbors. Anyhow, the only thing I've had used for are my walmart coupons but the ones that I used are for products that I used everyday. What's the sense of getting a dollar off coupon when the product that you're buying is three dollars more expensive that the brand that you currently using. You lose two dollars.