Before there was Seth Green, Lorne Greene, Soylent Green, and Ralph Nader's Green Party, there were S&H Green Stamps, named for the Sperry and Hutchinson company, which was founded in 1896. According to Wiki, the S&H rewards catalog was "the largest publication in the United States" during the 1960s. Folks would pick up stamps at grocery store checkouts, gas stations, etc. and redeem their books of stamps for products featured in the catalog.
A bio that I read a few years back of Jackie Kennedy Onassis said Jackie was a Green Stamp fiend during her days in the White House. When she found out what the stamps were for, she made sure that all White House employees asked for stamps with their purchases of food and other goods for the First Family. Apparently she loved looking through the catalog and, oh you know....gettin' free stuff.
My family never saved Green Stamps so I guess it makes sense that I am also someone who never seems to fill out rebate forms. As Wikipedia notes, this is called "Green Shield Stamp Syndrome." One of the reasons that the stamps -- and, later, rebate offers -- make sense for companies is because so many people never bother to cash them in.