Jim "Mattress Mack" McIngvale, owner of Gallery Furniture in Houston, . placed the bet at the DraftKings sportsbook at Scarlet Pearl casino in Biloxi, Mississippi. . I think it's the biggest [bet] that's ever happened in Mississippi. , Matt Kalish, DraftKings co-founder, via statement. The bet would pay out $7.7 million if the Houston Astros win the World Series. . I'm just amazed how much DraftKings and Scarlet Pearl took, and they didn't blink an eye. That's pretty rare in the sports betting business in the United States. , Jim McIngvale, via statement. The $3.5 million is almost equivalent to the total bet at Mississippi sportsbooks in June, July and August combined. . McIngvale placed a $200,000 World Series bet on the Astros in Las Vegas as well. . McIngvale has been in touch with several sportsbooks in New Jersey about making another large bet.