Give Mattress Mack credit: He doesn’t give up. Jim McIngvale, the Houston-based owner of Gallery Furniture who is better known as “Mattress Mack,” has been betting against the Kansas City Chiefs this postseason and paying dearly for it. He’s not done. BetMGM had been preparing Wednesday for a $1 million Super Bowl LIV bet on the San Francisco 49ers, and it came in. The bet was from McIngvale, according to The Action Network.