Radio listeners might have heard the kind of annoying commercials on BP/Amoco’s Gold Standard Game, which rewards customers for purchasing more than eight gallons of Amoco Ultimate by offering a chance to win “free gas for life” — that is, a $1,200 Amoco Ultimate prepaid gas card every year for 50 years. With an eight gallon purchase, customers receive a scratch-off card with two chances to win — once at the station, and once by…