How did Jim Mattress Mack McIngvale get so much money?

5 ways Houston is stronger after Harvey, as told by Mattress Mack - CultureMap Houston

Mattress Mack: The untold story of Houston's own Jim McIngvale

Astros fans petition for Mattress Mack first pitch in Game 6

Mattress Mack' collects $40M of his record winning bet in Las Vegas, Betting

Mattress Mack' Rebating Customers After Astros Win

Mattress Mack hauls wheelbarrow full of $10 million cash from World Series winnings: 'This money is heavy

If Astros repeat, gambler 'Mattress Mack' will earn $43.4M payout - ESPN

Mattress Mack lost $2.6 million betting on Kentucky Derby

Mattress Mack drops $2 million bet on Astros to win World Series

Mattress Mack' says he lost $13 million betting on the Houston Astros. Silver lining? The attention he got was worth $8.6 million for his store - MarketWatch

Mattress Mack asks Harris County voters to dish details about 'bad' experiences on Election Day 2022 – Houston Public Media