My “Big Fat Gift Card” has been an astonishing hit at the “Last Great Hamburger Stand.” Fatburger Restaurants says it is selling six times more in gift sales since it switched from paper gift certificates to plastic gift cards. The card was launched one-year ago with Dallas-based Paymentech. Fatburger uses the slogan “Plastic, never tasted so good” to promote the card. Fatburger Restaurants, founded in 1952, specialize in made-to-order hamburgers served in a 1950s, retro-style decor. The chain has more than 60 restaurants in Arizona, California, Colorado, Florida, Nevada, New Jersey, Pennsylvania and Washington.