 Plus, creating forever stamps reduce the need for top-up stamps, which cost more to print than they're worth. Meanwhile, the Postal Service requires the word forever be crossed out whenever the stamp is pictured. This is to prevent counterfeit copies. The stamps you actually purchase don't have a line through the word. Matt Murphy, Fox News. From the Automated Office System Studios on Seville 1075, BWCHV, FM, Charlottesville.